Finding the Fourth Proportional to 42.02, 57.99 and 28.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42.02 : 57.99 = 28.18 : x
2. Step 2: Convert to fraction form
   42.02/57.99 = 28.18/x
3. Step 3: Cross multiply
   42.02x = 57.99 × 28.18
4. Step 4: Simplify right side
   42.02x = 1,634.10
5. Step 5: Solve for x
   x = 1,634.10/42.02
6. Step 6: Final answer
   x = 38.89