Alright, let's work through 1812 times 787 step by step
1812 × 787 = 787 × (1812)
+ 787 × 2 that is equal 1574
+ 787 × 10 giving us 7870
+ 787 × 800 that equals 629600
+ 787 × 1000 giving us 787000

= 1426044
