Finding the Fourth Proportional to 42.98, 59.28 and 28.42

Step by Step Solution

1. Step 1: Write the proportion equation
   42.98 : 59.28 = 28.42 : x
2. Step 2: Convert to fraction form
   42.98/59.28 = 28.42/x
3. Step 3: Cross multiply
   42.98x = 59.28 × 28.42
4. Step 4: Simplify right side
   42.98x = 1,684.74
5. Step 5: Solve for x
   x = 1,684.74/42.98
6. Step 6: Final answer
   x = 39.20