Finding the Fourth Proportional to 78.52, 117.62 and 42.42

Step by Step Solution

1. Step 1: Write the proportion equation
   78.52 : 117.62 = 42.42 : x
2. Step 2: Convert to fraction form
   78.52/117.62 = 42.42/x
3. Step 3: Cross multiply
   78.52x = 117.62 × 42.42
4. Step 4: Simplify right side
   78.52x = 4,989.44
5. Step 5: Solve for x
   x = 4,989.44/78.52
6. Step 6: Final answer
   x = 63.54