For positive real nubers $a,b,c$ find the maximum real number $x$, such that there exist positive numbers $p,q,r$, such that $p+q+r=1$ and $x$ does not exceed numbers $a\frac{p}{q}, b\frac{q}{r}, c\frac{r}{p}$ 
1. We are given positive real numbers \(a, b, c\) and need to find the maximum real number \(x\) such that there exist positive numbers \(p, q, r\) with \(p + q + r = 1\) and \(x \leq a\frac{p}{q}, b\frac{q}{r}, c\frac{r}{p}\).

2. Let's denote \(a\frac{p}{q} = A\), \(b\frac{q}{r} = B\), and \(c\frac{r}{p} = C\). We need to find the maximum \(x\) such that \(x \leq A\), \(x \leq B\), and \(x \leq C\).

3. To find the maximum \(x\), we need to ensure that \(x\) is less than or equal to the minimum of \(A, B, C\). Therefore, we need to solve:
   \[
   x \leq \min\left(a\frac{p}{q}, b\frac{q}{r}, c\frac{r}{p}\right)
   \]

4. Assume \(x = \sqrt[3]{abc}\). We need to show that there exist \(p, q, r\) such that \(p + q + r = 1\) and:
   \[
   \sqrt[3]{abc} \leq a\frac{p}{q}, \quad \sqrt[3]{abc} \leq b\frac{q}{r}, \quad \sqrt[3]{abc} \leq c\frac{r}{p}
   \]

5. Let \(d = \sqrt[3]{abc}\). We need to find \(p, q, r\) such that:
   \[
   d \leq a\frac{p}{q}, \quad d \leq b\frac{q}{r}, \quad d \leq c\frac{r}{p}
   \]

6. Consider the following values for \(p, q, r\):
   \[
   p = \frac{d^2}{d^2 + ad + ab}, \quad q = \frac{ad}{d^2 + ad + ab}, \quad r = \frac{ab}{d^2 + ad + ab}
   \]

7. Verify that \(p + q + r = 1\):
   \[
   p + q + r = \frac{d^2}{d^2 + ad + ab} + \frac{ad}{d^2 + ad + ab} + \frac{ab}{d^2 + ad + ab} = \frac{d^2 + ad + ab}{d^2 + ad + ab} = 1
   \]

8. Check the inequalities:
   \[
   a\frac{p}{q} = a \frac{\frac{d^2}{d^2 + ad + ab}}{\frac{ad}{d^2 + ad + ab}} = a \frac{d^2}{ad} = d
   \]
   \[
   b\frac{q}{r} = b \frac{\frac{ad}{d^2 + ad + ab}}{\frac{ab}{d^2 + ad + ab}} = b \frac{ad}{ab} = d
   \]
   \[
   c\frac{r}{p} = c \frac{\frac{ab}{d^2 + ad + ab}}{\frac{d^2}{d^2 + ad + ab}} = c \frac{ab}{d^2} = d
   \]

9. Since \(d = \sqrt[3]{abc}\) satisfies all the inequalities, the maximum value of \(x\) is \(\sqrt[3]{abc}\).

The final answer is \( \boxed{ \sqrt[3]{abc} } \)