OK, this took some playing around, but I think this might work.
You need to open a new workbook, or worksheet, and format the cells that you WILL put data in. You must do this before you put the brazilian data into them.
You select the cells, and right click, and go to format cells, in the number tab, pick currency, and go all the way down to Portuguese (Brazilian)
Then paste or import your data to those cells.
Then you can convert them all to American currency by formatting all of those cells, with the now Brazilian currency, and choose the $ for the currency. This will reformat them for you.
Good luck
misscrf
Management is doing things right, leadership is doing the right things