Finding the Fourth Proportional to 72.55, 108.69 and 38.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.55 : 108.69 = 38.31 : x
2. Step 2: Convert to fraction form
   72.55/108.69 = 38.31/x
3. Step 3: Cross multiply
   72.55x = 108.69 × 38.31
4. Step 4: Simplify right side
   72.55x = 4,163.91
5. Step 5: Solve for x
   x = 4,163.91/72.55
6. Step 6: Final answer
   x = 57.39