Finding the Fourth Proportional to 57.69, 86.49 and 42.50

Step by Step Solution

1. Step 1: Write the proportion equation
   57.69 : 86.49 = 42.50 : x
2. Step 2: Convert to fraction form
   57.69/86.49 = 42.50/x
3. Step 3: Cross multiply
   57.69x = 86.49 × 42.50
4. Step 4: Simplify right side
   57.69x = 3,676.04
5. Step 5: Solve for x
   x = 3,676.04/57.69
6. Step 6: Final answer
   x = 63.72