Finding the Fourth Proportional to 95.50, 131.78 and 56.15

Step by Step Solution

1. Step 1: Write the proportion equation
   95.50 : 131.78 = 56.15 : x
2. Step 2: Convert to fraction form
   95.50/131.78 = 56.15/x
3. Step 3: Cross multiply
   95.50x = 131.78 × 56.15
4. Step 4: Simplify right side
   95.50x = 7,399.86
5. Step 5: Solve for x
   x = 7,399.86/95.50
6. Step 6: Final answer
   x = 77.49