Alright, let's work through 8487 times 7789 step by step
8487 × 7789 = 7789 × (8487)
+ 7789 × 7 resulting in 54523
+ 7789 × 80 that equals 623120
+ 7789 × 400 giving us 3115600
+ 7789 × 8000 producing 62312000

= 66105243
