Alright, let's work through 7790 times 4322 step by step
7790 × 4322 = 4322 × (7790)
+ 4322 × 0 that is equal 0
+ 4322 × 90 producing 388980
+ 4322 × 700 what gives us 3025400
+ 4322 × 7000 that is equal 30254000

= 33668380
