No, it's still wrong, immoral, to kill that innocent person to save the crowd of people.

You may, however, still choose to do it anyway, knowing full well that it's immoral.

If killing one innocent person will somehow magically save one million, that too is immoral. And I'd kill that one person to save the million regardless, accepting that it is an immoral act. It's a worthwhile thing to live with, to save so many. Obviously this is in the land of outlandish hypotheticals. Non-the-less, the morality is just the same if the ratio is 1 to 10, 1 to 100, or 1 to one million: intentionally killing - murdering - an innocent person is immoral in all circumstances.