The fourth chapter, which continued where "2" left off, opened early on Thursday night at 9PM to make $4.5 million including midnights then added another $10.5 million on Friday. The lo-fi horror movie reportedly cost only $5 million (roughly 1,000 times the cost of Oren Peli's original movie), which means that it was profitable as of Friday and even with the fairly big drop from the previous installment, we can probably expect a fifth and sixth movie sometime down the line. (UPDATE: Paramount have already announced via The Hollywood Reporter that there will be a Paranormal Activity 5 released next October.)
http://www.comingsoon.net/news/movienews.php?id=96211