Finding the Fourth Proportional to 42.49, 63.71 and 22.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42.49 : 63.71 = 22.15 : x
2. Step 2: Convert to fraction form
   42.49/63.71 = 22.15/x
3. Step 3: Cross multiply
   42.49x = 63.71 × 22.15
4. Step 4: Simplify right side
   42.49x = 1,411.31
5. Step 5: Solve for x
   x = 1,411.31/42.49
6. Step 6: Final answer
   x = 33.21