We look at the division of 86307651 by 684 
The aim is to understand the frequency of 684 in 86307651.

Let's proceed to step 1:
684 goes into 8 0 times with a remainder of 8.
Put 0 as the next digit of the answer. 
Result so far: 0.0
Deduct 0 from 8 and we're left with 8.
Take the next digit (6) from the dividend and append it to 8, then repeat: 86 / 684

On to step 2:
If we divide 86 by 684, we get 0 and a remainder of 86.
Write down 0 as next digit of the result. 
Result so far: 0.0
Deduct 0 from 86 and we're left with 86.
Bring next digit (3) of the dividend behind the 86 and repeat the process: 863 / 684

Step 3:
684 can be fit into 863 1 times, resulting in a remainder of 179.
Record the quotient 1 as the next digit in the result. 
Result so far: 1.0
Deduct 684 from 863 and we're left with 179.
Include the next digit (0) from the dividend after 179, then repeat: 1790 / 684

Step 4:
684 can be fit into 1790 2 times, resulting in a remainder of 422.
Record the quotient 2 as the next digit in the result. 
Result so far: 12.0
Subtract 1368 from 1790 to get 422.
Bring next digit (7) of the dividend behind the 422 and repeat the process: 4227 / 684

Step 5:
If we divide 4227 by 684, we get 6 and a remainder of 123.
The next digit of our result is 6. 
Result so far: 126.0
The remainder is 123 after subtracting 4104 from 4227.
Include the next digit (6) from the dividend after 123, then repeat: 1236 / 684

Step 6:
1236 divided by 684 is 1 with a remainder of 552.
Use 1 as the next digit of our solution. 
Result so far: 1261.0
Deduct 684 from 1236 and we're left with 552.
Bring next digit (5) of the dividend behind the 552 and repeat the process: 5525 / 684

On to step 7:
5525 divided by 684 is 8 with a remainder of 53.
Record the quotient 8 as the next digit in the result. 
Result so far: 12618.0
Deduct 5472 from 5525 and we're left with 53.
Bring next digit (1) of the dividend behind the 53 and repeat the process: 531 / 684

Step 8:
When dividing 531 by 684, we get 0 with a remainder of 531.
The number 0 becomes the next digit in our result. 
Result so far: 126180.0
Deduct 0 from 531 and we're left with 531.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5310, and continue the process.

Step 9:
684 can be fit into 5310 7 times, resulting in a remainder of 522.
Write down 7 as next digit of the result. 
Result so far: 126180.7
If we take 4788 away from 5310, we end up with 522.
Since there are no more digits in the dividend, we add a zero to the remainder making it 5220, and continue the process.

Step 10:
5220 divided by 684 is 7 with a remainder of 432.
Record the quotient 7 as the next digit in the result. 
Result so far: 126180.77
If we subtract 4788 from 5220, we get 432.
Since there are no more digits in the dividend, we add a zero to the remainder making it 4320, and continue the process.

The final outcome is 126180.77, with a leftover of 0.432.