Alright, let's work through 3862 times 4603 step by step
3862 × 4603 = 4603 × (3862)
+ 4603 × 2 yielding 9206
+ 4603 × 60 that is equal 276180
+ 4603 × 800 that results in 3682400
+ 4603 × 3000 that is equal 13809000

= 17776786
