Finding the Fourth Proportional to 78.88, 118.23 and 60.79

Step by Step Solution

1. Step 1: Write the proportion equation
   78.88 : 118.23 = 60.79 : x
2. Step 2: Convert to fraction form
   78.88/118.23 = 60.79/x
3. Step 3: Cross multiply
   78.88x = 118.23 × 60.79
4. Step 4: Simplify right side
   78.88x = 7,187.20
5. Step 5: Solve for x
   x = 7,187.20/78.88
6. Step 6: Final answer
   x = 91.12