Finding the Fourth Proportional to 42.18, 57.71 and 42.18

Step by Step Solution

1. Step 1: Write the proportion equation
   42.18 : 57.71 = 42.18 : x
2. Step 2: Convert to fraction form
   42.18/57.71 = 42.18/x
3. Step 3: Cross multiply
   42.18x = 57.71 × 42.18
4. Step 4: Simplify right side
   42.18x = 2,434.00
5. Step 5: Solve for x
   x = 2,434.00/42.18
6. Step 6: Final answer
   x = 57.71