looks like you haven't set your session to redirect the x-11 gui interface from runInstaller.
What happens if you try to execute 'xclock' ?
and please note that fedora is NOT a certified OS for running oracle. The certified OS's are clearly listed in the fine Installation Guide Preinstallation Requirements
You will need to run "xhost +" as root user and then start the installation again.
Also, as updated by Ed, Fedora is not an certified OS to run Oracle DB.