Need help designing an NPK ratio determining formula for a compost business

At our compost facility, we shred Carbon-rich Materials, Nitrogen-rich Materials, Phosphorus-rich Materials, and Potassium-rich Materials, then measure them in litters for blending to produce organic compost. we use an  Aerated Static Pile (ASP) COMPOST SYSTEM to convert organic waste into Organic compost. Our ASP has a total volume of 14,400 cubic feet. According to our math, 14,400 cubic feet is equivalent to 407,750.4 liters.

I would like some help designing a formula that will help us calculate how many liters of each raw material is needed when mixing to have a mix of raw materials equal to 407,750.4 Liters. Furthermore, the formula must consider that the ideal C:N ratio when mixing raw materials for composting is 30:1.  The formula should also allow us to manipulate Nitrogen, phosphorus, and potassium levels.