Finding the Fourth Proportional to 57.42, 86.67 and 57.42

Step by Step Solution

1. Step 1: Write the proportion equation
   57.42 : 86.67 = 57.42 : x
2. Step 2: Convert to fraction form
   57.42/86.67 = 57.42/x
3. Step 3: Cross multiply
   57.42x = 86.67 × 57.42
4. Step 4: Simplify right side
   57.42x = 4,976.59
5. Step 5: Solve for x
   x = 4,976.59/57.42
6. Step 6: Final answer
   x = 86.67