Float div’s to the right in left-to-right order?

You could apply a text-align: right to the container and a display: inline-block in place of the floating:

<div style="text-align: right">
  <div style="display:inline-block">Left</div>
  <div style="display:inline-block">Middle</div>
  <div style="display:inline-block">Right</div>
</div>

DEMO