Apple worth more than Microsoft and Google combined?

So today I read on Apple Insider that Apple stock has raised to all-time high, thus making the company's market capitalization $456 billion. That is a lot of billions! For comparison, that is more than Sweden's GDP.

Currently, Microsoft's market capitalization is around $256 billion and Google's $199 billion. That makes Apple worth more than the two companies combined!

What goes up, must come down. I believe that Apple's rise will soon decline. Maybe not in a year, maybe not in two years, but soon. Soon.