actually geosync isn't the top. You need to extend beyond that & have a counterweight that balances the weight of everything below the point of geosynchronous orbit. Otherwise it would fall down.
Counterweight or just more cable. IIRC it's 170k (miles? kilometers?) if you use no counterweight. And note how fast that outer end is moving, it can throw things pretty hard.
I mean the idea isn't actually real or practical. It's a thought experiment that makes for some fun calculus. No one's actually going to try and build one.
Of course, that would require a page 420 times longer, and I don't know if a browser would even support it.