Finding the Fourth Proportional to 78.75, 108.72 and 69.48

Step by Step Solution

1. Step 1: Write the proportion equation
   78.75 : 108.72 = 69.48 : x
2. Step 2: Convert to fraction form
   78.75/108.72 = 69.48/x
3. Step 3: Cross multiply
   78.75x = 108.72 × 69.48
4. Step 4: Simplify right side
   78.75x = 7,553.87
5. Step 5: Solve for x
   x = 7,553.87/78.75
6. Step 6: Final answer
   x = 95.92