Answer:
they will need to hire 8 supervisors to run the new warehouse efficiently.
Explanation:
First we need to identify the number of workers for the 36 bays, so if they need 4 workers for each bay, the how many workers are necessary for 36 bays. This is:
4 workers -------------------- 1 bay
X -------------------- 36 bays
Where X is the number of workers for 36 bays. Solving for X, we get:

Then, if there are 3 supervisors for 54 bay workers, how many supervisors are required for 144 workers. This is:
3 Supervisor ------------------------ 54 workers
Y ------------------------ 144 workers
Where Y is the number of supervisors for 144 workers. Solving for Y, we get:

Finally, they will need to hire 8 supervisors to run the new warehouse efficiently