Hello Grumbles,
I looked at the Griffith's Valuation extracts, on John Hayes website, which took place in Co. Wexford in 1853.
There's no sign of an Edward Fortune but there are five listings for a Nicholas. Maybe one is the grandfather of your 3rd great grandfather.
Nicholas Fortune, Ballinacoolabeg, Ardcolm, Wexford
Nicholas Fortune, Ballydusker, Killinick, Wexford
Nicholas Fortune, Knockstown, Killegney, Wexford
Nicholas Fortune, Churchtown, Hook, Wexford
Nicholas Fortune, Baldwinstown, Kilcowan, Wexford
Christopher