(Reuters) - MTV-owner Viacom Inc beat Wall Street estimates for fourth-quarter revenue on Thursday, helped by a rise in domestic advertising revenue.Net earnings from continuing operations attributable to Viacom fell to $303 million, or 75 cents per share, in the fourth quarter ended Sept. 30 from $386 million (£301.66 million), or 96 cents per share, a year earlier.Total revenue fell to $3.43 billion from $3.49 billion, but was above the average estimate of $3.41 billion, according to IBES..