That is in fact the million dollar question on the web. How to convert more impressions to clicks, and even more importantly, convert clicks into customers.
Right now you've got a 1.2% clickthrough rate - which in all honesty isn't so bad in the grand scheme of things. Essentially trulia is nothing more then a giant ad-banner for listings. You have absolutely no way to target your audience beyond a general "people interested in real estate", so you're working off of a very broad base. Given that 1.2% is actually pretty good.
Ultimately - I wouldn't worry about CTR too much. It's really kind of an out-of-date metric, and is really only used to calculate advertising costs, not actual results. Especailly given the amount of info on Trulia, those 78 viewers who didn't click through to the listing, probably felt they got enough information about the property.