I have seen recommendations for using 200 to 220 pixels per sq inch when sitting at least 1.5x times screen width away.
So e.g. if your projector is 1280x720, you get 921600 pixels. For 220 ppsi, you should have a screen area of 4189 sq inches, which for a 16:9 aspect ratio gives you a screen size of 86" wide, 48" tall and 99" diagonal.
Of course you also need to check if your projector throw distance works for this screen width.
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