No problem, we've got 3904 and 1721 to multiply
3904 × 1721 = 1721 × (3904)
+ 1721 × 4 that results in 6884
+ 1721 × 00 which equals 0
+ 1721 × 900 which equals 1548900
+ 1721 × 3000 what gives us 5163000

= 6718784
