Alright, let's work through 3407 times 3725 step by step
3407 × 3725 = 3725 × (3407)
+ 3725 × 7 which equals 26075
+ 3725 × 00 yielding 0
+ 3725 × 400 that is equal 1490000
+ 3725 × 3000 yielding 11175000

= 12691075
