The Philippines embassy usually doesn't ask for an I-134 unless they already suspect an issue (i.e. recent grad). Either way, I believe they go by the 100% of the federal poverty line guideline. For a family of 3 in the continental US, that's currently $20,160/year. That said, you will need 125% of the minimum for AOS after marriage, which would be $25,200/year in your case. These are minimums....it's up to the officer to make a determination on the likelihood of your fiance becoming a public charge. If so, they may request a joint sponsor.
