We look at the division of 3466131 by 399 
Let's see how many times 399 fits into 3466131.

Step 1:
399 goes into 3 0 times with a remainder of 3.
Record the quotient 0 as the next digit in the result. 
Result so far: 0.0
If we subtract 0 from 3, we get 3.
Include the next digit (4) from the dividend after 3, then repeat: 34 / 399

Moving on to step 2:
If we divide 34 by 399, we get 0 and a remainder of 34.
The number 0 becomes the next digit in our result. 
Result so far: 0.0
If we subtract 0 from 34, we get 34.
Bring next digit (6) of the dividend behind the 34 and repeat the process: 346 / 399

Let's proceed to step 3:
399 goes into 346 0 times with a remainder of 346.
Put 0 as the next digit of the answer. 
Result so far: 0.0
The remainder is 346 after subtracting 0 from 346.
Fetch the next digit (6) from the dividend, attach it to 346 and continue: 3466 / 399

Let's proceed to step 4:
The number 399 fits into 3466 8 times, leaving a remainder of 274.
Record the quotient 8 as the next digit in the result. 
Result so far: 8.0
Deduct 3192 from 3466 and we're left with 274.
Fetch the next digit (1) from the dividend, attach it to 274 and continue: 2741 / 399

Advancing to step 5:
The number 399 fits into 2741 6 times, leaving a remainder of 347.
Put 6 as the next digit of the answer. 
Result so far: 86.0
Subtracting 2394 from 2741 leaves us with 347.
Append the next digit (3) from the dividend to 347 and continue with: 3473 / 399

Going ahead to step 6:
The number 399 fits into 3473 8 times, leaving a remainder of 281.
The number 8 becomes the next digit in our result. 
Result so far: 868.0
Subtracting 3192 from 3473 leaves us with 281.
Bring next digit (1) of the dividend behind the 281 and repeat the process: 2811 / 399

Advancing to step 7:
If we divide 2811 by 399, we get 7 and a remainder of 18.
Use 7 as the next digit of our solution. 
Result so far: 8687.0
Subtract 2793 from 2811 to get 18.
Since there are no more digits in the dividend, we add a zero to the remainder making it 180, and continue the process.

Step 8:
The number 399 fits into 180 0 times, leaving a remainder of 180.
The number 0 becomes the next digit in our result. 
Result so far: 8687.0
If we subtract 0 from 180, we get 180.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1800, and continue the process.

Going ahead to step 9:
1800 divided by 399 is 4 with a remainder of 204.
The number 4 becomes the next digit in our result. 
Result so far: 8687.04
Deduct 1596 from 1800 and we're left with 204.
Since there are no more digits in the dividend, we add a zero to the remainder making it 2040, and continue the process.

Step 10:
The number 399 fits into 2040 5 times, leaving a remainder of 45.
Write down 5 as next digit of the result. 
Result so far: 8687.045
Deduct 1995 from 2040 and we're left with 45.
Since there are no more digits in the dividend, we add a zero to the remainder making it 450, and continue the process.

Going ahead to step 11:
When dividing 450 by 399, we get 1 with a remainder of 51.
Use 1 as the next digit of our solution. 
Result so far: 8687.0451
If we take 399 away from 450, we end up with 51.
Since there are no more digits in the dividend, we add a zero to the remainder making it 510, and continue the process.

Going ahead to step 12:
When dividing 510 by 399, we get 1 with a remainder of 111.
The number 1 becomes the next digit in our result. 
Result so far: 8687.04511
Subtract 399 from 510 to get 111.
Since there are no more digits in the dividend, we add a zero to the remainder making it 1110, and continue the process.

After the division, we end up with 8687.04511 and a remainder of 0.000111.