Alright, let's work through 7889 times 5423 step by step
7889 × 5423 = 5423 × (7889)
+ 5423 × 9 giving us 48807
+ 5423 × 80 that is equal 433840
+ 5423 × 800 producing 4338400
+ 5423 × 7000 yielding 37961000

= 42782047
