Finding the Fourth Proportional to 72.36, 108.59 and 50.55

Step by Step Solution

1. Step 1: Write the proportion equation
   72.36 : 108.59 = 50.55 : x
2. Step 2: Convert to fraction form
   72.36/108.59 = 50.55/x
3. Step 3: Cross multiply
   72.36x = 108.59 × 50.55
4. Step 4: Simplify right side
   72.36x = 5,489.15
5. Step 5: Solve for x
   x = 5,489.15/72.36
6. Step 6: Final answer
   x = 75.86