Question:
If $a$, $b$, and $c$ are integers satisfying $a + \frac 1b = \frac{22}{7}$, $b + \frac 1c = 8$, and $abc = 21$, then find $c + \frac 1a$. Express your answer as a common fraction.

Answer:
Let $x = c + \frac 1a$. Multiplying to take advantage of the symmetry, \begin{align*}\frac {22}7 \cdot 8 \cdot x &= \left(a + \frac 1b\right)\left(b + \frac 1c\right)\left(c + \frac 1a\right) \\
&= abc + a + b + c + \frac 1a + \frac 1b + \frac 1c + \frac{1}{abc} \\
&= 21 + \left(a + \frac 1b\right) + \left(b + \frac 1c \right) + \left(c + \frac 1a\right) + \frac{1}{21} \\
&= 21 + \frac{22}{7} + 8 + x + \frac 1{21} \\
&= \frac{29 \cdot 21 + 22 \cdot 3 + 1}{21} + x
\end{align*} Thus, $\frac{22 \cdot 8 \cdot 3}{21} x = \frac{29 \cdot 21 + 22 \cdot 3 + 1}{21} + x \Longrightarrow x = \frac{29 \cdot 21 + 22 \cdot 3 + 1}{22 \cdot 8 \cdot 3 - 21} = \frac{676}{507} = \boxed{\frac 43}.$