Alright, let's work through 4157 times 2620 step by step
4157 × 2620 = 2620 × (4157)
+ 2620 × 7 that equals 18340
+ 2620 × 50 which equals 131000
+ 2620 × 100 that results in 262000
+ 2620 × 4000 what gives us 10480000

= 10891340
