Alright, let's work through 4780 times 1689 step by step
4780 × 1689 = 1689 × (4780)
+ 1689 × 0 resulting in 0
+ 1689 × 80 giving us 135120
+ 1689 × 700 which equals 1182300
+ 1689 × 4000 what gives us 6756000

= 8073420
