Alright, let's work through 9720 times 786 step by step
9720 × 786 = 786 × (9720)
+ 786 × 0 yielding 0
+ 786 × 20 that is equal 15720
+ 786 × 700 that results in 550200
+ 786 × 9000 that results in 7074000

= 7639920
