Finding the Third Proportional to 5,142.87 and 8,255.71

Step by Step Solution

1. Step 1: Write the proportion equation
   5,142.87 : 8,255.71 = 8,255.71 : x
2. Step 2: Convert to fraction form
   5,142.87/8,255.71 = 8,255.71/x
3. Step 3: Cross multiply
   5,142.87x = 8,255.71 × 8,255.71
4. Step 4: Simplify right side
   5,142.87x = 68,156,771.15
5. Step 5: Solve for x
   x = 68,156,771.15/5,142.87
6. Step 6: Final answer
   x = 13,252.68