  We present a systematic study of the magnetic proximity effect in Pt,
depending on the magnetic moment and anisotropy of adjacent metallic
ferromagnets. Element-selective x-ray resonant magnetic reflectivity
measurements at the Pt absorption edge (11565$\,$eV) are carried out to
investigate the spin polarization of Pt in Pt/Co$_\textrm{1-x}$Fe$_\textrm{x}$
bilayers. We observe the largest magnetic moment of (0.72$\,\pm\,$0.03)$\,
\mu_\textrm{B}$ per spin polarized Pt atom in
Pt/Co$_\textrm{33}$Fe$_\textrm{67}$, following the Slater-Pauling curve of
magnetic moments in Co-Fe alloys. In general, a clear linear dependence is
observed between the Pt moment and the moment of the adjacent ferromagnet.
Further, we study the magnetic anisotropy of the magnetized Pt which clearly
adopts the magnetic anisotropy of the ferromagnet below. This is depicted for
Pt on Fe(001) and on Co$_\textrm{50}$Fe$_\textrm{50}$(001), which have a
45$^{\circ}$ relative rotation of the fourfold magnetocrystalline anisotropy.
