right align a block of text

[Csikos Bela]

Hello:

I would like to align to the right margin a block of text in the following way:
 - The end of the longest line in the block aligned to the right margin
 - The beginnings of the other lines in the block aligned to the beginning of
   the longest line in the block.

It would look like this:

left margin                                             right margin
                                                    text block longest
                                                    block shorter
                                                    another shorter

How can a do it in lyx/latex?

Thanks,

bcsikos