We have studied the solvation statics and dynamics of coumarin 153 dye in binary hexane-propionitrile solvent mixtures. The static and dynamic solvation of coumarin 153 in hexane-propionitrile shows that preferential solvation occurs in both the ground and excited states. We analyzed both the statics and dynamics of preferential solvation of coumarin 153 in hexane-propionitrile using Agmon's model, which is based on extension of the Smoluchowski aggregation model to the reversible case.