How to configure YUM/WGET to get through using PROXY ?

Better answer – use /etc/profile.d/proxy.[csh,sh]

You just need to create the following files in /etc/profile.d, and then this will work in *any* shell for *any* user of the system:
#proxy.sh
export http_proxy=http://host.com:port/
export ftp_proxy=http://host.com:port/
export no_proxy=.domain.com
export HTTP_PROXY=http://host.com:port/
export FTP_PROXY=http://host.com:port/
#proxy.csh
setenv http_proxy http://host.com:port/
setenv ftp_proxy http://host.com:port/
setenv no_proxy .domain.com
setenv HTTP_PROXY http://host.com:port/
setenv FTP_PROXY http://host.com:port/

After that, you can run YUM/WGET

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