(Reuters) - Activist investor Carl Icahn is pushing for the proposed merger of Xerox Corp and HP Inc , arguing that a union of the printer makers could make big profits for investors, the Wall Street Journal reported on Wednesday. Icahn, who owns a 10.6% stake in Xerox, has now taken a 4.24% stake in HP, valued at roughly $1.2 billion (£937.8 million), the Journal said.