Alright, let's work through 4220 times 864 step by step
4220 × 864 = 864 × (4220)
+ 864 × 0 producing 0
+ 864 × 20 what gives us 17280
+ 864 × 200 resulting in 172800
+ 864 × 4000 producing 3456000

= 3646080
