List.Max Vector3 issue with retrieving whole input

Hello, Just started using System.Linq, and I know it's taking me in the right direction.. just don't quite know how I would go about approaching this... I currently am using the X and Y values of a Vector3, with the Z value being equal to a different number from a different calculation. I want to be able to find the highest Z value and then find the corresponding X + Y coordinate. To reiterate; my problem is not getting a single value; it's getting the highest Z value in a Vector3, and then the actual Vector3 it corresponds to.