What it the highest common multiple of 33 77 and 132?

There is really no such thing as a "highest common multiple". Once you find a common multiple of a set of numbers, you can keep adding the CM to itself over and over again. Each new number you get will be a common multiple of your set of numbers, but each new number will always be larger than the previous. This means that you can keep adding while the number approaches infinity and you will still never find a greatest multiple.