<p>Three identical spheres each of mass M are placed at the corners of a right angled triangle with mutually perpendicular sides equal to 3 m each. Taking point of intersection of mutually perpendicular sides as origin, the magnitude of position vector of centre of mass of the system will be&nbsp;&nbsp;<span class="equation">\(\sqrt{x}\)</span>​​​​​​​m. The value of x is ____________.</p>