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Equations: Capacitance, ##C= Q/{\delta}V##

Field in the dielectrics

##E={\frac{\sigma}{k{\epsilon}_0}}##

I've found the fields in each dielectric, and the potential difference in each, but I'm getting hung up there. I've gotten down to, ##|{\delta}V|=({\frac{Q}{A{\epsilon}_0}})({\frac{1}{k_1}}+{\frac{1}{k_2}}+{\frac{1}{k_3}})##

My problem is, the A refers to the area of the conducting plate, but as i pointed out, nothing is said concerning dimensions of those plates.

Is there another method that does not care about the area that I'm missing?