  If the fourth generation fermions exist, the new quarks could influence the
branching ratio of the rare $B\to K^{*}\nu\bar{\nu}$ decay. Two possible
solutions of the fourth generation CKM factor
$(V^{*}_{\acute{t}s}V_{\acute{t}b})^(\pm)$ are obtained as a function of the
new $\acute{t}$-quark mass $(m_{\acute{t}})$ from the experimental results of
the $B\to X_{s}\gamma$ together with the semileptonic decay $B\to
X_{c}\ell\bar{\nu}$. The branching ratio of the decay $B\to K^{*}\nu\bar{\nu}$
in the two cases is estimated. In one case, a significant enhancement to the
branching ratio of the decay $B\to K^{*}\nu\bar{\nu}$ over the SM is recorded,
while results are almost same in another case. If a fourth generation should
exist in nature and nature chooses the former case, this B meson decay could be
a good probe to the existence of the fourth generation, or perhaps a signal for
a new physics.
