Alright, let's work through 7803 times 5145 step by step
7803 × 5145 = 5145 × (7803)
+ 5145 × 3 that is equal 15435
+ 5145 × 00 that results in 0
+ 5145 × 800 resulting in 4116000
+ 5145 × 7000 that equals 36015000

= 40146435
