Finding the Fourth Proportional to 78.78, 108.67 and 49.27

Step by Step Solution

1. Step 1: Write the proportion equation
   78.78 : 108.67 = 49.27 : x
2. Step 2: Convert to fraction form
   78.78/108.67 = 49.27/x
3. Step 3: Cross multiply
   78.78x = 108.67 × 49.27
4. Step 4: Simplify right side
   78.78x = 5,354.17
5. Step 5: Solve for x
   x = 5,354.17/78.78
6. Step 6: Final answer
   x = 67.96