Magnetic moments of V (Z = 23), Cr (Z = ~4), $\mathrm{Mn}$ (Z = 25) are x ,y, z respectively. Hence:

Since magnetic moment is known to be n(n+2) where n is the number of unpaired electrons, the magnetic moment increases as the number of unpaired electrons increases.
V has three paired electrons, Cr has six unpaired electrons, while $\mathrm{Mn}$has five unpaired electrons.
We are aware that when the number of unpaired electrons rises, the magnetic moment does as well.
So, y>z>x