No problem, we've got 4479 and 1780 to multiply
4479 × 1780 = 1780 × (4479)
+ 1780 × 9 what gives us 16020
+ 1780 × 70 giving us 124600
+ 1780 × 400 which equals 712000
+ 1780 × 4000 that equals 7120000

= 7972620
