Finding the Fourth Proportional to 72.71, 109.16 and 38.49

Step by Step Solution

1. Step 1: Write the proportion equation
   72.71 : 109.16 = 38.49 : x
2. Step 2: Convert to fraction form
   72.71/109.16 = 38.49/x
3. Step 3: Cross multiply
   72.71x = 109.16 × 38.49
4. Step 4: Simplify right side
   72.71x = 4,201.33
5. Step 5: Solve for x
   x = 4,201.33/72.71
6. Step 6: Final answer
   x = 57.78