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## Homework Statement

## Homework Equations

[tex]C = \frac QV[/tex]

[tex]C_{eq} = C_1 + C_2 +...[/tex] for capacitors in parallel.

[tex]C_{eq} = \frac{1}{\frac{1}{C_1}+\frac{1}{C_2}+...}[/tex] for capacitors in series.

## The Attempt at a Solution

The first thing I did was calculate the equivalent capacitance for the entire circuit to be 3 microfarads. From here I calculate the total amount of charge to be 9*10^-5 C. Then I consider the circuit with just [tex]C_4[/tex] and the equivalent capacitance of capacitors 1-3. It's just two capacitors in series, and charge should be equally distributed between capacitors in series, right? So I get [tex]C_4 = 4.5 * 10^{-5} C[/tex], but this is incorrect. What am I doing wrong?