Finding the Fourth Proportional to 42.02, 58.00 and 28.89

Step by Step Solution

1. Step 1: Write the proportion equation
   42.02 : 58.00 = 28.89 : x
2. Step 2: Convert to fraction form
   42.02/58.00 = 28.89/x
3. Step 3: Cross multiply
   42.02x = 58.00 × 28.89
4. Step 4: Simplify right side
   42.02x = 1,675.48
5. Step 5: Solve for x
   x = 1,675.48/42.02
6. Step 6: Final answer
   x = 39.88