Alright, let's work through 4078 times 5306 step by step
4078 × 5306 = 5306 × (4078)
+ 5306 × 8 that is equal 42448
+ 5306 × 70 yielding 371420
+ 5306 × 000 giving us 0
+ 5306 × 4000 giving us 21224000

= 21637868
