How can I form a word like "quadruple" for any number I want?

The usual way is just to find the Latin root and add the suffix: quintuple, sextuple, septuple, nonuple, etc.

For numbers beyond eight or nine, the -uple construction sounds rather strained, if not downright silly. (Duodecuple? Really?)

I'd recommend -fold as an alternative ("a ninety-fold increase"), or substitute another counter noun altogether: an "eighty-one piece orchestra"; "a sixteen-part vocal arrangement"; "a 48-pin connector."

Mathematicians use the term "n-tuple", sometimes replacing "n" with a numeral ("39-tuple") and sometimes leaving it as a variable. But I admit you don't see expressions like "39-tuple" outside the math literature.