It's in the templates installed with PowerPoint 2002. If you open PowerPoint
and look to the right in the "New Presentation" task pane, under "New from
Template" click on General Templates. Then click on the tab for Design
Templates and look for Proposal.
If you don't see the template, you may need to insert your install CDs and
run a custom install to add the "presentation designs" (I think they're
called).