Finding the Fourth Proportional to 78.84, 117.92 and 60.76

Step by Step Solution

1. Step 1: Write the proportion equation
   78.84 : 117.92 = 60.76 : x
2. Step 2: Convert to fraction form
   78.84/117.92 = 60.76/x
3. Step 3: Cross multiply
   78.84x = 117.92 × 60.76
4. Step 4: Simplify right side
   78.84x = 7,164.82
5. Step 5: Solve for x
   x = 7,164.82/78.84
6. Step 6: Final answer
   x = 90.88