Finding the Fourth Proportional to 72.29, 108.37 and 50.55

Step by Step Solution

1. Step 1: Write the proportion equation
   72.29 : 108.37 = 50.55 : x
2. Step 2: Convert to fraction form
   72.29/108.37 = 50.55/x
3. Step 3: Cross multiply
   72.29x = 108.37 × 50.55
4. Step 4: Simplify right side
   72.29x = 5,477.85
5. Step 5: Solve for x
   x = 5,477.85/72.29
6. Step 6: Final answer
   x = 75.78