[MarkoRamius1086]

That is an option, though a loft of that nature with the existing geometry shown will give a solid cone on the end of the tube.

If however, you want your cone to be hollow as well, you can add an addtional circle in the middle of the existing one, in hopes that it creates the wall. If that does not work, it would not take long to do a Revolve Operation. In that case, simply draw and dimension the upper half of the wanted section view, draw the centerline, and apply the revolve feature.

I was just teaching some of our kids how to do those two different strategies today actually! There are many youtube videos of Inventor and SolidWorks on youtube, and both may be helpful due to the similar nature of the two programs. If those do not solve your questions in a timely manner you can always PM me or post again!