Alright, let's work through 1987 times 2173 step by step
1987 × 2173 = 2173 × (1987)
+ 2173 × 7 giving us 15211
+ 2173 × 80 that equals 173840
+ 2173 × 900 that is equal 1955700
+ 2173 × 1000 that is equal 2173000

= 4317751
