(Reuters) – International Business Machines Corp, the worlds largest technology services company, reported a better-than-expected quarterly profit, helped by higher software revenue. Net profit rose 6 percent to $6.19 billion in the fourth quarter. On an adjusted basis, it earned $6.13 a share, beating analysts average estimate of $5.99 per share, according to Thomson Reuters I/B/E/S. Total revenue fell 5.5 percent to $27.7 billion, below analysts average estimate of $28.25 billion. (Reporting by Supantha Mukherjee and Soham Chatterjee; Editing by Savio DSouza)