If a 42.9 foot tall flagpole casts a 253.1 foot long shadow then how long is a shadow that 6.2 foot tall woman casts

The women's shadow would be 36.6ft. long. 
You have to set up a proportion   42.9             6.2
                                                          =    
                                                        253.1               X
Then you cross multiply (6.2*253.1) and divide (1569.22/42.9) equals 36.6