Finding the Fourth Proportional to 42.69, 58.52 and 42.15

Step by Step Solution

1. Step 1: Write the proportion equation
   42.69 : 58.52 = 42.15 : x
2. Step 2: Convert to fraction form
   42.69/58.52 = 42.15/x
3. Step 3: Cross multiply
   42.69x = 58.52 × 42.15
4. Step 4: Simplify right side
   42.69x = 2,466.41
5. Step 5: Solve for x
   x = 2,466.41/42.69
6. Step 6: Final answer
   x = 57.77