No problem, we've got 3807 and 4072 to multiply
3807 × 4072 = 4072 × (3807)
+ 4072 × 7 that is equal 28504
+ 4072 × 00 what gives us 0
+ 4072 × 800 yielding 3257600
+ 4072 × 3000 resulting in 12216000

= 15502104
