The main purpose of this article is to address a problem that amalgamates
approximation and optimization in the setting of a partially ordered set that is
endowed with a metric. Indeed, if A and B are non-void subsets of a partially ordered
set that is equipped with a metric, and S is a non-self mapping from A to B, this paper
scrutinizes the existence of an optimal approximate solution, called a best proximity
point of the mapping S, to the operator equation Sx = x where S is a continuous,
proximally monotone, ordered proximal contraction. Further, this paper manifests an
iterative algorithm for discovering such an optimal approximate solution. As a special
case of the result obtained in this article, an interesting fixed point theorem on partially
ordered sets is deduced.