Short answer - yes, it is possible.

To avoid that you may need to think about the barriers that make this scenario less likely:
1. Frame your solution such a way that it will be easier and more profitable to cooperate with you than copy
2. Select for begin small enough niche, so they don't bother
3. Get a patent for you technology

You may also try to ask them to sign NDA and Non-compete agreement before presenting the idea, but it will be extremely hard to do.