'Fourth' in the Bible

Then a fourth kingdom (Rome) will be strong as iron, for iron breaks to pieces and shatters all things; and like iron which crushes things in pieces, it will break and crush all these [others].

He answered, “Look! I see four men untied, walking around in the midst of the fire, and they are not hurt! And the appearance of the fourth is like a son of the gods!”

After this I kept looking in the night visions, and behold, [I saw] a fourth beast (the Roman Empire), terrible and extremely strong; and it had huge iron teeth. It devoured and crushed and trampled down what was left with its feet. It was different from all the beasts that came before it, and it had ten horns (ten kings).

“Then I wished to know the exact meaning of the fourth beast, which was different from all the others, extremely dreadful, with teeth of iron and claws of bronze, which devoured, crushed and trampled down what was left with its feet,

“Thus the angel said, ‘The fourth beast shall be a fourth kingdom on earth, which will be different from all other kingdoms and will devour the whole earth and tread it down, and crush it.

And now I will tell you the truth. Behold, three more kings are going to arise in Persia. Then a fourth will become far richer than all of them. When he becomes strong through his riches he will stir up the whole empire against the realm of Greece.