Sirius XM Radio ( SIRI) reported a pro forma fourth-quarter loss of $248.5 million, narrower than a pro forma loss of $405 million a year earlier as revenue gained and subscribers rose. On a GAAP basis, the loss in the fourth quarter was $245.8 million, or 8 cents a share. Adjusted fourth-quarter income from operations on a pro forma basis was $31.8 million, compared with an adjusted loss from operations of $224.1 million in the fourth quarter of 2007. Revenue in the quarter on a pro forma basis rose 16% to $644 million. Subscribers to the company's satellite radio service at the end of the 2008 rose 10% to 19 million subscribers from 17.3 million in 2007. The company added 82,945 net new subscribers in the fourth quarter, compared with 1.1 million net additions a year earlier. The fourth quarter was the company's first full quarter of combined operations following Sirius's acquisition in July 2008 of XM Satellite Radio. Last week, Sirius said it closed a $530 million investment deal with Liberty Media and extended the maturity of certain debt coming due in two months, to 2010. The completion of the deals gives Sirius XM about a year's breathing room. While the satellite radio's service is popular, it has been struggling under a heavy debt load. It faced a bankruptcy filing if it couldn't refinance or pay off debt coming due this year.