Alright, let's work through 9155 times 1728 step by step
9155 × 1728 = 1728 × (9155)
+ 1728 × 5 that is equal 8640
+ 1728 × 50 producing 86400
+ 1728 × 100 giving us 172800
+ 1728 × 9000 producing 15552000

= 15819840
