Finding the Fourth Proportional to 95.49, 131.72 and 78.86

Step by Step Solution

1. Step 1: Write the proportion equation
   95.49 : 131.72 = 78.86 : x
2. Step 2: Convert to fraction form
   95.49/131.72 = 78.86/x
3. Step 3: Cross multiply
   95.49x = 131.72 × 78.86
4. Step 4: Simplify right side
   95.49x = 10,386.98
5. Step 5: Solve for x
   x = 10,386.98/95.49
6. Step 6: Final answer
   x = 108.78