Alright, let's work through 7420 times 3870 step by step
7420 × 3870 = 3870 × (7420)
+ 3870 × 0 yielding 0
+ 3870 × 20 which equals 77400
+ 3870 × 400 resulting in 1548000
+ 3870 × 7000 yielding 27090000

= 28715400
