KUALA LUMPUR, May 11 (Reuters) - Malaysia’s current account surplus fell to 12.3 billion ringgit ($2.99 billion) in the first quarter from 19.0 billion ringgit in the previous three months, the Department of Statistics said on Tuesday. Portfolio investment saw a net inflow of 0.4 billion ringgit compared with outflows of 6.9 billion ringgit in the fourth quarter. ($1 = 4.1135 ringgit) (Reporting by Joseph Sipalan; Editing by Jacqueline Wong) Our Standards: The Thomson Reuters Trust Principles.