Alright, let's work through 5857 times 8700 step by step
5857 × 8700 = 8700 × (5857)
+ 8700 × 7 which equals 60900
+ 8700 × 50 resulting in 435000
+ 8700 × 800 giving us 6960000
+ 8700 × 5000 that results in 43500000

= 50955900
