Stitch’s amputation

My poor doggy, Stitch,  got hit by a car on the 5th of November. He has broken his right femur into 3 pieces and is in really bad pain. I’ve spoken with a vet and a surgeon and they said our best option is to take the leg... the estimated cost for his surgery is up towards 1200$ . Due to my financial problem , I cannot afford to pay for all his amputation fee. I feel this is our best option for my dog to live his normal life again . And I’m sorry but I also ask for your help . Anything will help . Thank you