Two points $A, B$ are randomly chosen on a circle with radius $100.$ For a positive integer $x$, denote $P(x)$ as the probability that the length of $AB$ is less than $x$. Find the minimum possible integer value of $x$ such that $\text{P}(x) > \frac{2}{3}$.
1. **Fixing Point \( A \)**:
   - Consider a circle with radius \( 100 \) and fix a point \( A \) on the circle.
   - We need to find the probability that the length of \( AB \) is less than \( x \) for a randomly chosen point \( B \) on the circle.

2. **Using Law of Cosines**:
   - Let \( O \) be the center of the circle.
   - The length \( AB \) can be found using the Law of Cosines in the isosceles triangle \( AOB \):
     \[
     AB^2 = OA^2 + OB^2 - 2 \cdot OA \cdot OB \cdot \cos(\angle AOB)
     \]
     Since \( OA = OB = 100 \), we have:
     \[
     AB^2 = 100^2 + 100^2 - 2 \cdot 100 \cdot 100 \cdot \cos(\angle AOB)
     \]
     \[
     AB^2 = 20000 - 20000 \cos(\angle AOB)
     \]
     \[
     AB = 100 \sqrt{2(1 - \cos(\angle AOB))}
     \]

3. **Probability Calculation**:
   - We need \( AB < x \), which implies:
     \[
     100 \sqrt{2(1 - \cos(\angle AOB))} < x
     \]
     \[
     \sqrt{2(1 - \cos(\angle AOB))} < \frac{x}{100}
     \]
     \[
     2(1 - \cos(\angle AOB)) < \left(\frac{x}{100}\right)^2
     \]
     \[
     1 - \cos(\angle AOB) < \frac{x^2}{20000}
     \]
     \[
     \cos(\angle AOB) > 1 - \frac{x^2}{20000}
     \]

4. **Angle Consideration**:
   - The angle \( \angle AOB \) ranges from \( 0 \) to \( 360^\circ \).
   - The probability that \( \cos(\angle AOB) > 1 - \frac{x^2}{20000} \) is equivalent to the fraction of the circle's circumference where this condition holds.
   - The cosine function is symmetric and periodic with period \( 360^\circ \). For \( \cos(\theta) \) to be greater than a certain value, the corresponding angle range can be found using the inverse cosine function.

5. **Finding the Angle**:
   - Let \( \theta = \cos^{-1}\left(1 - \frac{x^2}{20000}\right) \).
   - The total angle range where \( \cos(\angle AOB) > 1 - \frac{x^2}{20000} \) is \( 2\theta \).
   - The probability \( P(x) \) is then:
     \[
     P(x) = \frac{2\theta}{360^\circ} = \frac{\theta}{180^\circ}
     \]

6. **Setting the Probability**:
   - We need \( P(x) > \frac{2}{3} \):
     \[
     \frac{\theta}{180^\circ} > \frac{2}{3}
     \]
     \[
     \theta > 120^\circ
     \]
     \[
     \cos^{-1}\left(1 - \frac{x^2}{20000}\right) > 120^\circ
     \]
     \[
     1 - \frac{x^2}{20000} < \cos(120^\circ)
     \]
     \[
     1 - \frac{x^2}{20000} < -\frac{1}{2}
     \]
     \[
     \frac{x^2}{20000} > \frac{3}{2}
     \]
     \[
     x^2 > 30000
     \]
     \[
     x > \sqrt{30000} \approx 173.205
     \]

7. **Finding the Minimum Integer Value**:
   - The minimum integer value of \( x \) that satisfies this condition is \( 174 \).

The final answer is \( \boxed{174} \).