Finding the Fourth Proportional to 90.47, 135.59 and 76.71

Step by Step Solution

1. Step 1: Write the proportion equation
   90.47 : 135.59 = 76.71 : x
2. Step 2: Convert to fraction form
   90.47/135.59 = 76.71/x
3. Step 3: Cross multiply
   90.47x = 135.59 × 76.71
4. Step 4: Simplify right side
   90.47x = 10,401.30
5. Step 5: Solve for x
   x = 10,401.30/90.47
6. Step 6: Final answer
   x = 114.98