* Q4 profit 470 mln riyals, up 30.4 pct - Reuters calculations* Beats analyst forecasts* Hikes dividend to 4.25 riyals/share for 2014 (2013 = 4 riyals)(Adds context, details)DUBAI, Jan 18 (Reuters) - Qatar Islamic Bank QISB.QA (QIB), the Gulf state&aposs largest sharia-compliant lender by assets, reported a 30.4 percent jump in fourth-quarter net profit on Sunday, according to Reuters calculations