Alright, let's work through 1145 times 3787 step by step
1145 × 3787 = 3787 × (1145)
+ 3787 × 5 that is equal 18935
+ 3787 × 40 that is equal 151480
+ 3787 × 100 that equals 378700
+ 3787 × 1000 that is equal 3787000

= 4336115
