Alright, let's work through 7899 times 3191 step by step
7899 × 3191 = 3191 × (7899)
+ 3191 × 9 which equals 28719
+ 3191 × 90 that results in 287190
+ 3191 × 800 that results in 2552800
+ 3191 × 7000 that equals 22337000

= 25205709
