Jan 20 (Reuters) - Morgan Stanley posted a 57% rise in fourth-quarter profit on Wednesday, as the Wall Street bank’s trading business benefited from coronavirus-induced volatility in financial markets. Net income applicable to common shareholders rose to $3.27 billion, or $1.81 per share, in the quarter ended Dec. 31, compared with $2.09 billion, or $1.30 per share, a year earlier. Analysts had expected a profit of $1.27 per share, according to Refinitiv IBES data. (Reporting by Ambar Warrick in Bengaluru and Matt Scuffham in New York; Editing by Shounak Dasgupta)