BEIJING, Oct 7 (Reuters) - China’s foreign exchange reserves fell to $3.201 trillion at the end of September, down from $3.232 trillion at the end of August, official data showed on Thursday. China held $109.18 billion of gold reserves at the end of last month, down from $113.69 billion at the end of August, data from the central bank’s State Administration of Foreign Exchange showed. (Reporting by Jenny Su and Tom Daly, Editing by Timothy Heritage)