Finding the Fourth Proportional to 78.84, 118.24 and 42.27

Step by Step Solution

1. Step 1: Write the proportion equation
   78.84 : 118.24 = 42.27 : x
2. Step 2: Convert to fraction form
   78.84/118.24 = 42.27/x
3. Step 3: Cross multiply
   78.84x = 118.24 × 42.27
4. Step 4: Simplify right side
   78.84x = 4,997.79
5. Step 5: Solve for x
   x = 4,997.79/78.84
6. Step 6: Final answer
   x = 63.40