How the Math works for the Goods

I am playing around in the Goods Editor and trying to get the cell value to show the actual max reserve for natural resources. I am currently working on Coal and I put 225,000 in the Temperate Deciduous Forest Section under Biome Baseline Production window. No other Multipliers or Distribution currently. The cell I am using as my test is currently showing 4,960,012.58. Just trying to figure out the Math behind it so I can tweak accordingly. How does that 225,000 convert into that larger number?