Alright, let's work through 4387 times 2745 step by step
4387 × 2745 = 2745 × (4387)
+ 2745 × 7 which equals 19215
+ 2745 × 80 that is equal 219600
+ 2745 × 300 yielding 823500
+ 2745 × 4000 that equals 10980000

= 12042315
