Finding the Fourth Proportional to 42.53, 58.73 and 28.76

Step by Step Solution

1. Step 1: Write the proportion equation
   42.53 : 58.73 = 28.76 : x
2. Step 2: Convert to fraction form
   42.53/58.73 = 28.76/x
3. Step 3: Cross multiply
   42.53x = 58.73 × 28.76
4. Step 4: Simplify right side
   42.53x = 1,688.64
5. Step 5: Solve for x
   x = 1,688.64/42.53
6. Step 6: Final answer
   x = 39.71