Finding the Fourth Proportional to 28.47, 42.42 and 28.35

Step by Step Solution

1. Step 1: Write the proportion equation
   28.47 : 42.42 = 28.35 : x
2. Step 2: Convert to fraction form
   28.47/42.42 = 28.35/x
3. Step 3: Cross multiply
   28.47x = 42.42 × 28.35
4. Step 4: Simplify right side
   28.47x = 1,202.61
5. Step 5: Solve for x
   x = 1,202.61/28.47
6. Step 6: Final answer
   x = 42.24