New Post: Validate total across multiple properties

I have a group of "percentage" properties in my view model. As a simple example:

public class ViewModel
{
     public int Percent1 { get; set; }
     public int Percent2 { get; set; }
     public int Percent3 { get; set; }
     public int Percent4 { get; set; }
}

I need to write a validation rule that ensures the total of these four properties equals 100. From what I've read, fluent validation requires that a rule be applied to an individual property rather than across multiple properties.

Is there an elegant way to do this within the confines of the FluentValidation framework?