NEW YORK : Strong box-office results from “Dawn of the Planet of the Apes” helped produce stronger-than-expected results Tuesday for Rupert Murdoch’s media-entertainment group 21st Century Fox. Murdoch’s conglomerate, which includes the Fox studios, reported a net profit of $1.04 billion in the quarter ended September 30. The earnings were down 17 percent from a year earlier but per-share profits adjusted for special items were ahead of most Wall Street forecasts. Revenues also were better than anticipated, rising 12 percent from a year ago to $7.89 billion. Murdoch, who is chairman and chief executive, said the results “were driven by continued momentum at our cable network programming and filmed entertainment segments, reflecting sustained increases in affiliate fees as well as the global box office success of ‘Dawn of the Planet of the Apes’ and ‘The Fault in Our Stars.’”  In cable TV, revenues were up 15 percent, led by gains in revenues from regional sports channels.  The company noted that it would be investing in new sports channels. On broadcast, revenues were down amid lower advertising receipts and a drop in ratings on the Fox broadcast network.