Calculate percent columns by several tables

Hello, I am new to Power BI environment, and I am learning on my own.

I would like to ask for your help to start creating my first reports.

In my case, I have 4 tables: Projects,Tasks,Timecards,User, where Projects are not directly connected to Timecards but they are directly connected to Tasks and then Taks is directly connected to Timecards

All the tables are linked by a correct relation.

Could you tell me the DAX functions to have, for each project in the Projects table, a new column in Project table that has the calculation of the percentage of hours consumed (in table Timecard) compared to the estimated hours (in table Projects) ?

For example:

Projects has:

PR1 -->72 hours

PR2 --> 16 hours

Tasks has:

Task PR1 --> TASK1_1

Task PR1 --> TASK1_2

Task PR2 --> TASK2_1

Timecard has:

PR1--> 60 (total of timecard for all users) (SUM of all timecards of the task for PR1) 

PR2 --> 7 (total of timecard for all users) (SUM of all timecards of the task for PR2) 

In the table Projects i'd like to have a new % column "PRC_CONSUMED" , that has the % of consumed time compared of the nominal project budget ,and use this value to create reports to monitor Project started, at limit of budget , etc...

Thanks in advance,

Domenico