Printing table cells from right to left

I make a table and want the first cell to start from right instead of from left as default. I tried changing the float attribute in CSS but it doesn't seem to help. Here is the code:

<table border="0" width="100%" cellspacing="0" align="center" class="result_table">
    <tr align="right">
    <th bgcolor="#cccccc" align="right">1</th>
    <th bgcolor="#cccccc" size="17">2</th>
    <th bgcolor="#cccccc">3</th>
    <th bgcolor="#cccccc">4</th>
    </tr>

</table>

<style>
    table.result_table {
        float:right;
    }
</style>

Can anyone suggest a way to change the float of this table?