Alright, let's work through 8720 times 7766 step by step
8720 × 7766 = 7766 × (8720)
+ 7766 × 0 producing 0
+ 7766 × 20 that equals 155320
+ 7766 × 700 producing 5436200
+ 7766 × 8000 that results in 62128000

= 67719520
