Finding the Fourth Proportional to 72.54, 108.72 and 38.31

Step by Step Solution

1. Step 1: Write the proportion equation
   72.54 : 108.72 = 38.31 : x
2. Step 2: Convert to fraction form
   72.54/108.72 = 38.31/x
3. Step 3: Cross multiply
   72.54x = 108.72 × 38.31
4. Step 4: Simplify right side
   72.54x = 4,165.06
5. Step 5: Solve for x
   x = 4,165.06/72.54
6. Step 6: Final answer
   x = 57.42