Apache as reverse proxy for multiple destinations and one default destination

Wrap your ProxyPass references in a <VirtualHost> definition, like this:

<VirtualHost *:*>
ProxyPreserveHost On
ProxyPass / http://192.168.111.2/
ProxyPassReverse / http://192.168.111.2/
ServerName hostname.example.com
</VirtualHost>

Create two separate ones with the ServerNames you want, then another without ServerName or the Proxy options defined (just DocumentRoot). Put that one last.

More info here.