Let $n \ge 3$ be an integer. Find the minimal value of the real number $k_n$ such that for all positive numbers $x_1, x_2, ..., x_n$ with product $1$, we have $$\frac{1}{\sqrt{1 + k_nx_1}}+\frac{1}{\sqrt{1 + k_nx_2}}+ ... + \frac{1}{\sqrt{1 + k_nx_n}} \le n - 1.$$
1. **Initial Assumption and Simplification:**
   We start by assuming \( x_1 = x_2 = \cdots = x_n = 1 \). This simplifies the given inequality to:
   \[
   \sum_{i=1}^{n} \frac{1}{\sqrt{1 + k_n}} \leq n - 1
   \]
   Since each term in the sum is the same, we have:
   \[
   \frac{n}{\sqrt{1 + k_n}} \leq n - 1
   \]
   Dividing both sides by \( n \):
   \[
   \frac{1}{\sqrt{1 + k_n}} \leq 1 - \frac{1}{n}
   \]
   Squaring both sides:
   \[
   \frac{1}{1 + k_n} \leq \left(1 - \frac{1}{n}\right)^2
   \]
   Simplifying the right-hand side:
   \[
   \left(1 - \frac{1}{n}\right)^2 = 1 - \frac{2}{n} + \frac{1}{n^2}
   \]
   Therefore:
   \[
   \frac{1}{1 + k_n} \leq 1 - \frac{2}{n} + \frac{1}{n^2}
   \]
   Taking the reciprocal:
   \[
   1 + k_n \geq \frac{1}{1 - \frac{2}{n} + \frac{1}{n^2}}
   \]
   Simplifying the denominator:
   \[
   1 - \frac{2}{n} + \frac{1}{n^2} = \frac{n^2 - 2n + 1}{n^2} = \left(\frac{n-1}{n}\right)^2
   \]
   Thus:
   \[
   1 + k_n \geq \left(\frac{n}{n-1}\right)^2
   \]
   Therefore:
   \[
   k_n \geq \left(\frac{n}{n-1}\right)^2 - 1 = \frac{n^2}{(n-1)^2} - 1 = \frac{n^2 - (n-1)^2}{(n-1)^2} = \frac{2n-1}{(n-1)^2}
   \]

2. **Verification of \( k_n = \frac{2n-1}{(n-1)^2} \):**
   We need to show that:
   \[
   \sum_{i=1}^{n} \frac{1}{\sqrt{1 + \frac{(2n-1)x_i}{(n-1)^2}}} \leq n - 1
   \]
   Given \( x_1 x_2 \cdots x_n = 1 \), assume the inequality does not hold for some \( x_i \). Then there exists \( M > n-1 \) and \( a_i > 0 \) such that:
   \[
   \frac{1}{\sqrt{1 + \frac{(2n-1)x_i}{(n-1)^2}}} = M a_i
   \]
   This implies:
   \[
   a_i < \frac{1}{n-1}
   \]
   and:
   \[
   1 = \prod_{i=1}^{n} \left[ \frac{(n-1)^2}{2n-1} \left( \frac{1}{M^2 a_i^2} - 1 \right) \right]
   \]
   Simplifying:
   \[
   \left( \frac{(2n-1)}{(n-1)^2} \right)^n < \prod_{i=1}^{n} \left( \frac{1}{(n-1)^2 a_i^2} - 1 \right)
   \]
   Let \( 1 - (n-1)a_i = b_i > 0 \) and note that \( \sum_{i=1}^{n} b_i = 1 \). The inequality becomes:
   \[
   (n-1)^{2n} \prod_{i=1}^{n} b_i \prod_{i=1}^{n} (2 - b_i) > (2n-1)^n \left( \prod_{i=1}^{n} (1 - b_i) \right)^2
   \]
   Using AM-GM:
   \[
   \prod_{i=1}^{n} (2 - b_i) \leq \left( \frac{2n-1}{n} \right)^n
   \]
   Thus:
   \[
   \left( \prod_{i=1}^{n} (1 - b_i) \right)^2 < \frac{(n-1)^{2n}}{n^n} b_1 b_2 \cdots b_n
   \]
   We need to prove:
   \[
   \prod_{i=1}^{n} (a_1 + a_2 + \cdots + a_{k-1} + a_{k+1} + \cdots + a_n)^2 \geq \frac{(n-1)^{2n}}{n^n} a_1 a_2 \cdots a_n (a_1 + a_2 + \cdots + a_n)^n
   \]
   This can be proved by induction.

3. **Base Case \( n = 3 \):**
   \[
   \frac{\left( \prod (a + b) \right)^2}{abc} \geq \frac{\left( \frac{8}{9} (a + b + c) (ab + bc + ca) \right)^2}{abc} \geq \frac{64}{27} (a + b + c)^3
   \]

4. **Inductive Step:**
   Assume the inequality holds for \( n \). For \( n+1 \), let \( a_1, a_2, \ldots, a_{n+1} \) be positive real numbers. Assume \( a_1 \leq a_2 \leq \cdots \leq a_{n+1} \) and \( a_1 + a_2 + \cdots + a_{n+1} = 1 \). Applying the inductive hypothesis:
   \[
   \prod_{i=1}^{n} (1 - a_i)^2 \geq \frac{(n-1)^{2n}}{n^n} a_1 a_2 \cdots a_n
   \]
   We need to prove:
   \[
   \prod_{i=1}^{n} (a_{n+1} + 1 - a_i)^2 \geq \frac{n^{2n+2}}{(n+1)^{n+1}} a_1 a_2 \cdots a_{n+1} (1 + a_{n+1})^{n+1}
   \]
   Using Huygens' inequality and AM-GM:
   \[
   \prod_{i=1}^{n} \left( 1 + \frac{a_{n+1}}{1 - a_i} \right)^2 \geq \left( 1 + \frac{a_{n+1}}{\sqrt{\prod_{i=1}^{n} (1 - a_i)}} \right)^{2n} \geq \left( 1 + \frac{n a_{n+1}}{n-1} \right)^{2n}
   \]
   We need to show:
   \[
   \left( 1 + \frac{n a_{n+1}}{n-1} \right)^{2n} \geq \frac{n^{3n+2}}{(n-1)^{2n} (n+1)^{n+1}} a_{n+1} (1 + a_{n+1})^{n+1}
   \]
   If \( a_{n+1} \geq \max(a_1, a_2, \ldots, a_n) \geq \frac{1}{n} \), let \( \frac{n(1 + a_{n+1})}{n+1} = 1 + x \), where \( x \) is nonnegative. The inequality becomes:
   \[
   \left( 1 + \frac{x}{n(x+1)} \right)^{2n} \geq \frac{1 + (n+1)x}{(x+1)^{n-1}}
   \]
   Using Bernoulli's inequality:
   \[
   \left( 1 + \frac{x}{n(x+1)} \right)^{2n} \geq \frac{3x + 1}{x + 1}
   \]
   Also, \( (1 + x)^{n-1} \geq 1 + (n-1)x \). It suffices to prove:
   \[
   \frac{3x + 1}{x + 1} \geq \frac{1 + (n+1)x}{1 + (n-1)x}
   \]
   This is trivial. Thus, the inequality holds for \( k_n = \frac{(2n-1)}{(n-1)^2} \).

The final answer is \( \boxed{\frac{2n-1}{(n-1)^2}} \).