Finding the Fourth Proportional to 95.72, 131.83 and 78.20

Step by Step Solution

1. Step 1: Write the proportion equation
   95.72 : 131.83 = 78.20 : x
2. Step 2: Convert to fraction form
   95.72/131.83 = 78.20/x
3. Step 3: Cross multiply
   95.72x = 131.83 × 78.20
4. Step 4: Simplify right side
   95.72x = 10,308.75
5. Step 5: Solve for x
   x = 10,308.75/95.72
6. Step 6: Final answer
   x = 107.70