Now that being broken - By the death of Alexander.
Whereas four stood up for it - Stood up in its place.
Four kingdoms shall stand up - Ultimately. It is not necessary to suppose that this would be immediately. If four such should in fact spring out of this one kingdom, all that implied in the prophecy would be fulfilled. On the fulfillment of this, see the notes at Daniel 8:8.
But not in his power - No one of these four dynasties had at any time the power which was wielded by Alexander the Great.