No problem, we've got 4487 and 4728 to multiply
4487 × 4728 = 4728 × (4487)
+ 4728 × 7 what gives us 33096
+ 4728 × 80 what gives us 378240
+ 4728 × 400 that is equal 1891200
+ 4728 × 4000 resulting in 18912000

= 21214536
