Unfortunately, Fortnite Battle Royale is not currently available on Xbox 360 or PS3 and this is unlikely to change, mostly because the consoles don't support Unreal Engine 4 which runs the game. read more
I have a Xbox 360 slim and i can tell you that unfortunately Fortnite is not supported anymore but if you have a Windows 10 PC, You CAN play Fortnite. It is not supported for Windows 7 but if you have a Windows 7 pc you need a VM like VirtualBox from Oracle. read more
Welcome to /r/FortniteBR. Fortnite Battle Royale is a free-to-play Battle Royale game mode within the First universe. You can access the co-op Fortnite: Save The World subreddit at /r/Fortnite. read more