Finding the Fourth Proportional to 42.72, 63.98 and 22.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42.72 : 63.98 = 22.42 : x
2. Step 2: Convert to fraction form
   42.72/63.98 = 22.42/x
3. Step 3: Cross multiply
   42.72x = 63.98 × 22.42
4. Step 4: Simplify right side
   42.72x = 1,434.43
5. Step 5: Solve for x
   x = 1,434.43/42.72
6. Step 6: Final answer
   x = 33.58