Alright, let's work through 4007 times 9420 step by step
4007 × 9420 = 9420 × (4007)
+ 9420 × 7 yielding 65940
+ 9420 × 00 resulting in 0
+ 9420 × 000 resulting in 0
+ 9420 × 4000 yielding 37680000

= 37745940
