Finding the Fourth Proportional to 78.66, 108.72 and 69.54

Step by Step Solution

1. Step 1: Write the proportion equation
   78.66 : 108.72 = 69.54 : x
2. Step 2: Convert to fraction form
   78.66/108.72 = 69.54/x
3. Step 3: Cross multiply
   78.66x = 108.72 × 69.54
4. Step 4: Simplify right side
   78.66x = 7,560.39
5. Step 5: Solve for x
   x = 7,560.39/78.66
6. Step 6: Final answer
   x = 96.11