Let $\{x\}$ be a sequence of positive reals $x_1, x_2, \ldots, x_n$, defined by: $x_1 = 1, x_2 = 9, x_3=9, x_4=1$. And for $n \geq 1$ we have:

\[x_{n+4} = \sqrt[4]{x_{n} \cdot x_{n+1} \cdot x_{n+2} \cdot x_{n+3}}.\]

Show that this sequence has a finite limit. Determine this limit.
To show that the sequence $\{x_n\}$ has a finite limit and to determine this limit, we will proceed as follows:

1. **Define the sequence and its properties:**
   Given the sequence $\{x_n\}$ with initial values:
   \[
   x_1 = 1, \quad x_2 = 9, \quad x_3 = 9, \quad x_4 = 1
   \]
   and the recurrence relation for $n \geq 1$:
   \[
   x_{n+4} = \sqrt[4]{x_n \cdot x_{n+1} \cdot x_{n+2} \cdot x_{n+3}}
   \]

2. **Transform the sequence using logarithms:**
   Define a new sequence $\{y_n\}$ such that:
   \[
   y_n = \log_3 x_n
   \]
   This transforms the recurrence relation into:
   \[
   y_{n+4} = \frac{y_n + y_{n+1} + y_{n+2} + y_{n+3}}{4}
   \]
   with initial values:
   \[
   y_1 = \log_3 1 = 0, \quad y_2 = \log_3 9 = 2, \quad y_3 = \log_3 9 = 2, \quad y_4 = \log_3 1 = 0
   \]

3. **Analyze the transformed sequence:**
   The recurrence relation for $\{y_n\}$ is a linear homogeneous recurrence relation. We can write it in matrix form:
   \[
   \begin{pmatrix}
   y_{n+4} \\
   y_{n+3} \\
   y_{n+2} \\
   y_{n+1}
   \end{pmatrix}
   =
   \begin{pmatrix}
   \frac{1}{4} & \frac{1}{4} & \frac{1}{4} & \frac{1}{4} \\
   1 & 0 & 0 & 0 \\
   0 & 1 & 0 & 0 \\
   0 & 0 & 1 & 0
   \end{pmatrix}
   \begin{pmatrix}
   y_n \\
   y_{n+1} \\
   y_{n+2} \\
   y_{n+3}
   \end{pmatrix}
   \]

4. **Find the eigenvalues of the matrix:**
   The characteristic polynomial of the matrix is:
   \[
   \det\left(
   \begin{pmatrix}
   \frac{1}{4} & \frac{1}{4} & \frac{1}{4} & \frac{1}{4} \\
   1 & 0 & 0 & 0 \\
   0 & 1 & 0 & 0 \\
   0 & 0 & 1 & 0
   \end{pmatrix}
   - \lambda I
   \right) = 0
   \]
   Solving this, we find the eigenvalues to be $\lambda = 1, -i, i, -1$.

5. **Analyze the long-term behavior:**
   The eigenvalue $\lambda = 1$ indicates that the sequence $\{y_n\}$ will converge to a constant value as $n \to \infty$. The other eigenvalues ($-i, i, -1$) have magnitudes less than or equal to 1, which means their contributions will diminish over time.

6. **Determine the limit:**
   Since $\{y_n\}$ converges to a constant value, let $L$ be this limit. Then:
   \[
   L = \frac{L + L + L + L}{4} \implies L = L
   \]
   This confirms that $\{y_n\}$ converges to a constant value. Given the initial values and the symmetry, the limit $L$ must be the average of the initial values:
   \[
   L = \frac{0 + 2 + 2 + 0}{4} = 1
   \]

7. **Transform back to the original sequence:**
   Since $y_n = \log_3 x_n$ and $y_n \to 1$, we have:
   \[
   \log_3 x_n \to 1 \implies x_n \to 3^1 = 3
   \]

The final answer is $\boxed{3}$