What is the ruling on the prayers I performed without ghusl, assuming that what came out of me was madhy (pre-seminal fluid), but then it became clear that it was maniy (seminal fluid), and how do I make up for them given my ignorance of their number?

Whoever doubts whether what exited him is maniy (sperm) or madhiy (prostatic fluid/pre-ejaculate), then he has the choice to consider it maniy and perform ghusl (ritual bath), or consider it madhiy and wash off the madhiy. This is the fatwa (religious edict) that is acted upon, and he is not required to make up past prayers. If it is highly probable that the impurity of the madhiy has been removed, this is sufficient, and his prayer is valid even if he prayed with the impurity of madhiy unknowingly or forgetfully.