Alright, let's work through 7124 times 1007 step by step
7124 × 1007 = 1007 × (7124)
+ 1007 × 4 that is equal 4028
+ 1007 × 20 that is equal 20140
+ 1007 × 100 yielding 100700
+ 1007 × 7000 that is equal 7049000

= 7173868
