Finding the Fourth Proportional to 92.71, 139.20 and 38.71

Step by Step Solution

1. Step 1: Write the proportion equation
   92.71 : 139.20 = 38.71 : x
2. Step 2: Convert to fraction form
   92.71/139.20 = 38.71/x
3. Step 3: Cross multiply
   92.71x = 139.20 × 38.71
4. Step 4: Simplify right side
   92.71x = 5,388.43
5. Step 5: Solve for x
   x = 5,388.43/92.71
6. Step 6: Final answer
   x = 58.12