Peacock, the streaming service of Comcast’s entertainment unit NBCUniversal, has posted a widened fourth-quarter loss of $552 million, compared with $372 million in the year-ago period. Due to its sports and entertainment lineup, Peacock posted $1.6 billion in total revenue, up from $1.3 billion the year-ago quarter. The streamer recorded 44 million paying subscribers, compared with 41 million at the end of the third quarter and 36 million a year ago, the company said Thursday. Content and experiences revenue rose 5.4 percent to $12.7 billion, as media revenue, which includes NBCUniversal, was up 5.5 percent to $7.6 billion. The division shed 245,000 video customers during the fourth quarter, and lost another 181,000 broadband subscribers.