to design a 2nd Order Sallen-Key HPF
Set 

$$ \frac{R_4}{R_3}\Big(\frac{s^2}{s^2+s*(\frac{1}{R_1C_1}+\frac{1}{R_2C_2})+\frac{1}{R_1C_1R_2C_2}}\Big)= \frac{s^2}{s^2+s\zeta(2\pi f_c)+(2\pi f_c)^2}$$

The s term and constant in the s-polynomial should equal each other.

$$ \frac{1}{R_1C_1}+\frac{1}{R_2C_2}=\zeta(2\pi f_c)$$
$$ \frac{1}{R_1C_1R_2C_2}=(2\pi f_c)^2$$  

I couldn't get it working without choosing one of the capacitors as I solve the expression above for R1C1 from the bottom equation. Sine the poles should be the same  R1C1 and R2C2 need to be set to 3kHz it would make sense to choose a different capacitor. I didn't mess with the gain term because that will not change the filter poles.