Finding the Fourth Proportional to 42.53, 58.72 and 28.73

Step by Step Solution

1. Step 1: Write the proportion equation
   42.53 : 58.72 = 28.73 : x
2. Step 2: Convert to fraction form
   42.53/58.72 = 28.73/x
3. Step 3: Cross multiply
   42.53x = 58.72 × 28.73
4. Step 4: Simplify right side
   42.53x = 1,687.03
5. Step 5: Solve for x
   x = 1,687.03/42.53
6. Step 6: Final answer
   x = 39.67