Finding the Fourth Proportional to 78.09, 116.58 and 60.88

Step by Step Solution

1. Step 1: Write the proportion equation
   78.09 : 116.58 = 60.88 : x
2. Step 2: Convert to fraction form
   78.09/116.58 = 60.88/x
3. Step 3: Cross multiply
   78.09x = 116.58 × 60.88
4. Step 4: Simplify right side
   78.09x = 7,097.10
5. Step 5: Solve for x
   x = 7,097.10/78.09
6. Step 6: Final answer
   x = 90.88