How scale drawing to specific size?

[hsmokey]

Unfortunately it is still does not seem to be scaling to the requested size- Please see attached image- I have tried image > scale image. Though my preferred size is entered (7,200 x 10,800 pixels), it doesn't seem to adjust the size at all. When I just select 'shift' and 's' for the scale tool, it will adjust the size, but still not to exactly to 7,200 x 10,800 (it will only to one or the other)- Also did 'crop to content' so shouldn't be any transparent background-

Ideas?