EMERGING MARKETS-LatAm currencies extend gains, Brazil's central bank intervenes

SAO PAULO, April 29 (Reuters) - Latin American currencies extended their gains for a fourth day on Friday on dovish signs from the Federal Reserve, prompting the Brazilian central bank to step up intervention to halt a surge of the real that hit an eight-month high. Brazil's central bank offered up to $2.5 billion in reverse currency swaps in three auctions after the real hit 3.45 per dollar. It was the first central bank intervention in a week. Other Latin American currencies also stren