Finding the Fourth Proportional to 42.69, 58.89 and 28.12

Step by Step Solution

1. Step 1: Write the proportion equation
   42.69 : 58.89 = 28.12 : x
2. Step 2: Convert to fraction form
   42.69/58.89 = 28.12/x
3. Step 3: Cross multiply
   42.69x = 58.89 × 28.12
4. Step 4: Simplify right side
   42.69x = 1,655.99
5. Step 5: Solve for x
   x = 1,655.99/42.69
6. Step 6: Final answer
   x = 38.79