First of all, we need to understand how Google decide website’s page rank, Google Page rank is based on back links. Back links are Links pointing to your website from another website.
The more back links you have the higher your PR will be, if you can get more back links then you can easily get higher PR.
Below are some method of back links.
1. Join forums, blogs and other discussion group.
2. Submit to search engine directories.
3. Create useful information in your website for you audience and then they will cite your website in other places.
4. Links from related websites including Google advertisement will be another great way to increase PR.
Nothing is easy. You have to write meaningful articles and press releases with a link back to your site. Blogs, blog comments, forum comments and mini article sites/lenses are the way to go. But they require 3-4 hours a day of work.