Cin ,
You are running X server 4.1.0 check
https://www.xfree86.org/4.1.0/manindex4.html
the list of the suported drivers and you will not see the radeon.
also it looks that X server is taking the driver ati , which is not for ati radeon cards. If there is a radeon driver you can check
1) check if driver is present
[root@node1 root]# ls -la /usr/X11R6/lib/modules/drivers/ | grep radeon
-rwxr-xr-x 1 root root 91312 Sep 5 2002 radeon_drv.o
if you did get a line like above it means the driver is there and you have to define it in config file
My system is rh8.1 and it had the radeon driver , so there is no need to go to the latest rh.9 ->
Any whay the solution for you is to upgrade the X windoews to the latest
https://www.xfree86.org/4.3.0/manindex4.html check the link and you will
see that radeon is suported in 4.3.0 latest X ..
i am not sure about your chipset .. (check the supported chipset on that page )
If you need redhat 7.2 but need a to run X 11 on the radeon card upgrade the X11 ..
if the prerequisite for you task is not rh 7.2 go to the latest or to the one that supports your card .
If you knoe how to do it good if not then .. it is a longer story
but is solvable.