SSRS Format as Millions,Thousands.Hundreds

I'm putting together a profit and loss report in SQL Server Reporting Services (SSRS). I need to *display* a number, e.g. 1023488.06, as 1,023.5. I've gotten as far as putting #,#,;(#,#,);- in the format property of the relevant textboxes. This yields 1,024. I don't want to do this via dividing by 1000 and rounding, because users of the report will want to export these online reports into Excel and manipulate them. So I need to preserve the dollars and cents. I just want to change the display of the data, not the data.

I'm not trying to convert numbers into words. I now see that my subject line may have led you to think I am. My question is asking if it's possible to *format* numbers a certain way, without *changing* the data itself, like one can do with custom formatting in Excel: http://www.exceltip.com/st/Rounding_Numbers_to_Thousands_with_Hundreds_as_a_Decimal/63.html

You probably have to force the exact delimiters with the switch (for instance in a date format: dd-mm-yyyy). Without that switch, the delimiters set in the Windows settings take precendence.