Finding the Fourth Proportional to 92.43, 139.35 and 86.56

Step by Step Solution

1. Step 1: Write the proportion equation
   92.43 : 139.35 = 86.56 : x
2. Step 2: Convert to fraction form
   92.43/139.35 = 86.56/x
3. Step 3: Cross multiply
   92.43x = 139.35 × 86.56
4. Step 4: Simplify right side
   92.43x = 12,061.79
5. Step 5: Solve for x
   x = 12,061.79/92.43
6. Step 6: Final answer
   x = 130.50