Connecting tables with different granularity and creating DAX measures that uses figures from both

So I need help regarding tables with different granularity, the join between them with the dax measure subracting between them.

In Table 1, I have a fact table of the tasks employees have booked time too on a particalar day. 

Next in Table 2 i have a DIM table with which tasks are part of which project along with status etc

These two tables are connected by the task number

I also have a DIM Calendar connected to the fact Table 1 via Date

Now this all rolls up fine. I can put Toyota in a matrix along with the Hours booked column and i get the right totals.

However I also have Table 3 that has forecasted hours by Project

Now how do i somehow connect these table together so that eventually get a table like this:

Which i can then use to create measures/calc columns where i can subtract total hours from the forecast hours, create condional formatting measures etc etc.

Many thanks