A point charge ${\mathrm{q}}_1=4{\mathrm{q}}_0$is placed at origin. Another point charge ${\mathrm{q}}_2=-{\mathrm{q}}_0$ is placed at $\mathrm{x} = 12 \mathrm{cm}$. Charge of proton is q₀ .The proton is placed on x axis so that the electrostatic force on the proton is zero. In this situation, the position of the proton from the origin is _____________cm.