adds forecast, recasts lead, shares June 23 (Reuters) - IT services company Accenture Plc ACN.N forecast fourth-quarter revenue below expectations on Thursday, expecting a hit from high inflation and the impact of a stronger dollar on its overseas earnings. A hawkish Federal Reserve and heightened geopolitical tensions have driven gains in the dollar against a basket of currencies over the last year. The forecast reflects the company's assumption of a negative 8% foreign-exchange impact, Accenture said.