What exactly do these numbers represent?

[Jawbreaker]

Re the blue numbers the total enhanced numbers from the base damage? Is that what the cap is represented by?

thanks for any info

[Vanden]

That's how much bigger the other numbers are getting

[ArchVileTerror]

ie:  259 x 1.969 = 509.96

(not exactly, since "259" and "96.9%" aren't actually accurate, and there's a rounding error in the displayed values)

[Snarky]

It is the gross base unenhanced power value on the left. The number on the right is the adjusted value from the enhancers in that power. I do not believe this includes global enhancements from  enhancement set bonuses or temporary buffs from team powers. It will include buffs from things like alpha incarnate slot since those go directly onto enhancer bonuses. As stated above the number May not be completely accurate. 

[Shred Monkey]

Also.... the part you're in control of is the blue %.  That's how much damage is added from the enhancements you've slotted.   Know that if you add up the damage enhancements that you have slotted, they won't add up to 96.9% due to "Enhancement Diversification" or ED.   If you want the math details check Paragon Wiki or other sources, but basically after around 96% further damage enhancements get reduced to almost nothing.

 

The exception is the Incarnate alpha slots.  These are able to ignore ED caps by their stated %.