So, basically they are losing ~$900,000/month. In April, they were completely out of capital and sold shares of the company to raise ~$14.7million, ~$3.3million of which immediately paid off bridge loans. That leaves $11.7million available for operating since April 16th, 2010.
$11.7million only lasts 13 months at a $900,000/month burn rate. From this, we can expect Prosper to be out of money again some time around May/June of 2011.