Alright, let's work through 4638 times 7800 step by step
4638 × 7800 = 7800 × (4638)
+ 7800 × 8 yielding 62400
+ 7800 × 30 which equals 234000
+ 7800 × 600 that equals 4680000
+ 7800 × 4000 what gives us 31200000

= 36176400
