Forces and equilibrium — practice question

A particle of mass $0.2\,\mathrm{kg}$ is fastened to one end of a light inextensible string. The opposite end of the string is fixed at a point on a vertical wall. The particle is held in equilibrium by a force of magnitude $X\,\mathrm{N}$, acting at right angles to the string, with the string taut and inclined at an angle of $30^\circ$ to the wall (see the diagram).