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Hi Dave,
Here’s my 2 cents. If you can fit 2 fingers next to each other on other cords such as the Em or Am then your fingers should fit on the G cord. I think it just takes practice. You may have to move your fingers up or down, or change your hand position. You should try playing around with it. I guess I just figure you will have to put 2 fingers next to each other in many cords anyway so why not practice.
I originally learned the G using 3 fingers but now I’m forcing myself to do the 4 finger G. My hand does not have complete muscle memory yet and it’s slower for me to transition but I’m much better now than when I started and I do like the fuller sound better.
The other thought is your guitar. If your string width (nut width) is narrow depending on the make/model this will make it harder or easier. You may want to check out other guitars and see if that makes a difference. Ultimately you want to enjoy the process so maybe play with 3 fingers and practice 4 fingers or just do what keeps you playing.