I attached a pic with my work on it. Hope this helps!
 
        
        
        
It is actually not 28 because the volume of a cylinder is:  pi r^2 x h which in this case is pi x 36 x 4 which equals 452.39 rounded up
        
             
        
        
        
Answer: x = 1/4
Explanation: I did the math myself, but answer might be wrong...
 
        
             
        
        
        
15.4838709677 is the answer