Verified answer

http://www.howtogeek.com/forum/topic/quad-boot

I agree with all who say to use GRUB boot loader. I also want to recommend that you get a large hard drive. I'd say about 1TB will do. After all, you will have four operating systems on there, as well as other programs that will go along with them.

Yes you can. In your situation I would recommend using GRUB a your boot loader. It's easier to work with and add/edit/remove partitions.

Absolutely! I would suggest installing Linux last, as that will install the GRUB bootloader and configure it for you automatically.