Finding the Fourth Proportional to 42.34, 63.50 and 18.28

Step by Step Solution

1. Step 1: Write the proportion equation
   42.34 : 63.50 = 18.28 : x
2. Step 2: Convert to fraction form
   42.34/63.50 = 18.28/x
3. Step 3: Cross multiply
   42.34x = 63.50 × 18.28
4. Step 4: Simplify right side
   42.34x = 1,160.78
5. Step 5: Solve for x
   x = 1,160.78/42.34
6. Step 6: Final answer
   x = 27.42