Position an avatar in x=151.892
object.GetControl("Transform").GetDataBlock().SetData("Position/PositionX", RLPy.RTime(200), RLPy.RVariant(151.892))
It will travel to x=65,783

This is only for the X axis when you use an avatar. Setting Y and Z for avatars works fine.
Using a prop works with X, Y and Z so no bugs there.