Which cylinder is the 4 on a 4.6 liter Triton motor?

There's no single "cylinder 4" in the way you might think on a 4.6L Triton V8. The 4.6L Triton is a V8, meaning it has two banks of four cylinders each arranged in a "V" shape. Therefore, there's a cylinder 4 on each bank (one on the left and one on the right side of the engine). You'd need to specify which bank you're referring to (passenger side or driver's side) to get a definitive answer. Engine diagrams and repair manuals will clearly show the cylinder numbering.