cheat engine can change anything... If one were good enough with it, one could essentially make a program anything they wanted, by placing runable instructions at the right places... (i think)
The only problem about using cheat engine is that you need to know (roughly) what kind of value it is and need to be able when exactly it changes, which is incredibly easy here. Sometimes you need to perform an action to get the game to read the new money value and reprint it on the screen, but you can do that by just buying or selling something.
Essentially: Select your browser in CE, enter you current money value, run it a few times, change your money value somehow (buy/sell) and search for the new value, repeat until you get it.