Alright, let's work through 1139 times 3857 step by step
1139 × 3857 = 3857 × (1139)
+ 3857 × 9 that equals 34713
+ 3857 × 30 that is equal 115710
+ 3857 × 100 that equals 385700
+ 3857 × 1000 resulting in 3857000

= 4393123
