The numbering of cylinders in a V6 or V8 engine isn't sequential in a simple left-to-right order like in an inline engine. The numbering scheme depends on the specific engine's design and manufacturer's specifications. To know the location of a specific cylinder, you'd need a diagram of that particular engine. You cannot simply assume a cylinder's location based on a generalized "cylinder 3".
To find out more about the specific cylinder arrangement, you would need the engine code (found on a sticker usually under the hood) and then consult a repair manual or online diagrams for that exact engine.
