Alright, let's work through 4387 times 4915 step by step
4387 × 4915 = 4915 × (4387)
+ 4915 × 7 resulting in 34405
+ 4915 × 80 producing 393200
+ 4915 × 300 which equals 1474500
+ 4915 × 4000 what gives us 19660000

= 21562105
