To solve this problem using the geometric mean, we first need to understand the context and relationships in the triangle.
In a right triangle, the length of the altitude from the right angle to the hypotenuse can be found using the geometric mean of the lengths of the two segments of the hypotenuse that the altitude creates. If we denote the lengths of these segments as \( a \) and \( b \), the length of the altitude \( h \) can be expressed as follows:
\[ h = \sqrt{a \cdot b} \]
However, since we don't have any specific values or segments mentioned in your query, we cannot directly calculate \( x \) (the shortest leg of the triangle) without additional context or values relating to the segments of the triangle.
For rounding and response options, if we assume we had computed or determined a value for \( x \) using the geometric mean and got a result that fits one of the options, we would choose accordingly.
If you provide the values of the segments or any other relevant measurements, I can help calculate \( x \) and determine the shortest leg of the triangle. Otherwise, any answer must be derived from from the geometric mean calculations based on provided dimensions, which are currently missing.