MGM Mirage Profit Up, Debt to Hit 4th Qtr  LOS ANGELES/NEW YORK (Reuters) - Casino operator MGM Mirage  &lt;A HREF="http://www.investor.reuters.com/FullQuote.aspx?ticker=MGG.N target=/stocks/quickinfo/fullquote"&gt;MGG.N&lt;/A&gt; on Wednesday reported higher third-quarter earnings due  to Las Vegas strength, but said debt financing for its Mandalay  acquisition would hit fourth-quarter profit.