Alright, let's work through 7112 times 4320 step by step
7112 × 4320 = 4320 × (7112)
+ 4320 × 2 that equals 8640
+ 4320 × 10 that results in 43200
+ 4320 × 100 that equals 432000
+ 4320 × 7000 which equals 30240000

= 30723840
