How to change position of the vertex of polylin

I draw polyline using command line prividing all the coords:

    line 27.037,34.726 29.341,20.869 17.470,20.135

Now I want to change position of midle point to 28.915,21.367

How can I do it?

Several ways:

easiest to me:

1, draw a circle of by (point, radius) at new position ( 28.915,21.367 ). the radius is not important here, using 1 or 5 doesn't matter;

2, select the line;

3, enable snap to center only, disable other snap options;

4, click and hold on the point you want to move, which is shown with color now ( 29.341,20.869 ); drag it to the new position by snap point ( ( 28.915,21.367 ), release mouse;

5, use selection pointer or Ctl-K to unselect the line.

6, select the circle drawn in step 1, delete it by Modify->Delete selected (or Del key from keyboard).

another general way is by Modify->Properties

please add option to directly specify polyline vertex coordinates in window