X and her sister Y, were the registered owners of a parcel of land. They executed a special power of attorney in favor of their brother, B, authorizing him to sell the property for and in their behalf. X, however, died a few days afterwards. About four months after the death of X, B sold the land to DE Realty. The sale was duly registered. Subsequently, A, administrator of the estate of X, brought an action for the reconveyance of X's share in the property on the ground that the contract of sale as far as X is concerned is unenforceable. Will the action prosper? Why? Explain