I'm not sure that works Erika - the top edge isn't square which makes room 1 too small.
It's one of those problems where there are an infinite number of solutions, but finding any of them mathematiclly is fiendishly complex! The easiest solution I'd say is trial and error.
To reduce complexity make the divisions between the rooms horizontal. Start with room 1, draw a fill, then with the fill area text shown, repeatedly stretch the base using the 'offset edge' button in the pet palette in ever-reducing increments down to the nearest mm until the area displays correctly. Draw the next fill using this boundary as the starting point and repeat.
As a hint, I believe room 1 should be 18.084m long. The rest shouldn't take you longer than 10mins to work out using this method!
Hope that helps!