Alright, let's work through 5157 times 3643 step by step
5157 × 3643 = 3643 × (5157)
+ 3643 × 7 what gives us 25501
+ 3643 × 50 that results in 182150
+ 3643 × 100 what gives us 364300
+ 3643 × 5000 that results in 18215000

= 18786951
