Who or what is this fourth beast? Could it be China? China fits into Daniel 7 description 'nicely'. But how is that?
1) China is the only communist country growing stronger. All the other existing countries (Cuba, N.Korea) is collapsing under their own doing. But not China. It is growing from strength to strength...exceedingly strong in many aspects.
2) China has huge military power i.e. numbers and technology. China's President Xi Jinping has warned certain countries (Taiwan, Hong Kong, Tibet) that it will smashed its enemies bodies and bones to the ground...breaking in pieces and trampling the residue with its feet.
3) China has shown it has what it takes to oppress and devour its population systematically i.e. Christians and Muslims. No mercy is shown to any groups dissenting its Communist party rule. One of the rule is that no religion is permitted to practice freely in this atheistic country. No one and no religious institution is able to escape from its tyrannical claws!
4) China military power and capabilities is yet to be comprehended fully by the world superpowers. Is has never participated in any major war for now (Afghanistan, Iraq etc) nevertheless the nations of the world are wary of its might. The countries around China does not want to put the beast in an uncomfortable position eventhough China has encroached into these nations very sovereignty for the last 20 years.
Hence, China could be the fourth beast that will rise at the end of the age. Let's wait and see what it does with the money and the technology it has. It is vicious and acts without mercy just like what Daniel has described in chapter 7.
Lastly, it has made a deal with the oldest running government in the world to strangle and uproot whatever remaining underground churches there are in China.
Let's wait and see.