Alright, let's work through 3861 times 1330 step by step
3861 × 1330 = 1330 × (3861)
+ 1330 × 1 yielding 1330
+ 1330 × 60 that results in 79800
+ 1330 × 800 that is equal 1064000
+ 1330 × 3000 producing 3990000

= 5135130
