Finding the Fourth Proportional to 78.52, 117.72 and 60.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78.52 : 117.72 = 60.42 : x
2. Step 2: Convert to fraction form
   78.52/117.72 = 60.42/x
3. Step 3: Cross multiply
   78.52x = 117.72 × 60.42
4. Step 4: Simplify right side
   78.52x = 7,112.64
5. Step 5: Solve for x
   x = 7,112.64/78.52
6. Step 6: Final answer
   x = 90.58