You can embed content from slideshare.net, like the one below

Business Models Beyond Profit - Social Entrepreneurship Lecture

Upload your PPT to slideshare.net, get the embed code for wordpress, it looks like this

[slideshare id=1904118&doc=2009-05-18-bremen-bmsocialentrepreneurshippdfweb-090825094001-phpapp02]

Place the above code between  

Start Tage: {slideshare}

Code: place the wordpress code for your ppt inside start tag and end tag

End Tage: {"/"slideshare} remove the " " from this end tag

Finally it will look simlar to

{slid...} your code {/slid..}

Click Save. It should Work.