Alright, let's work through 3990 times 4733 step by step
3990 × 4733 = 4733 × (3990)
+ 4733 × 0 resulting in 0
+ 4733 × 90 producing 425970
+ 4733 × 900 what gives us 4259700
+ 4733 × 3000 resulting in 14199000

= 18884670
