Hi everyone
Hopefully someone can point me int he right direction.
I have an object I want to make fatter at one end

To help you understand image a egg, and take the bottom half of that egg and make it bigger, but the top half has to stay exactly as it is
It is possible to manipulate a file in this manner? Maybe to skew it using only four points in a bounding box??
And if so which program out there is most suitable?

I have used Blender, Tinkercad, Autodesk 123d, Meshmixer, Meshlab and Daz
But I just cant seem to get any of these programs to do what I want to do

Anyhelp would be most appreciated
Cheers
Julie