Finding the Fourth Proportional to 42.69, 58.93 and 28.16

Step by Step Solution

1. Step 1: Write the proportion equation
   42.69 : 58.93 = 28.16 : x
2. Step 2: Convert to fraction form
   42.69/58.93 = 28.16/x
3. Step 3: Cross multiply
   42.69x = 58.93 × 28.16
4. Step 4: Simplify right side
   42.69x = 1,659.10
5. Step 5: Solve for x
   x = 1,659.10/42.69
6. Step 6: Final answer
   x = 38.86