What is the procedure to transfer owner ship, when one of the co-owner is missing?

I have inherited a property from my father. My father and his 3 brothers were co-owners of this property. Two of them agreed to transfer the property in my name. But the third brother is missing from last 40 years. I don’t know whereabouts of him and his age should be almost 85 years if he is alive. Now what is procedure to transfer the full ownership in my name.