How does one port the Unreal Engine 4 to unsupported platforms? UE4 is said to be very scale able if so how would do so?
UE4 already supports a huge variety of platforms, if not all of the major ones.
What platform are you trying to build for? Supporting a new platform not yet listed would require significant changes to it’s source code. This is neither easy, or efficient use of time 
The usual suspects for porting requests are Wii U (2, 3) and Windows Phone.