We're going to solve 4389 multiplied by 1809
4389 × 1809 = 1809 × (4389)
+ 1809 × 9 resulting in 16281
+ 1809 × 80 that results in 144720
+ 1809 × 300 producing 542700
+ 1809 × 4000 producing 7236000

= 7939701
