Finding the Third Proportional to 8,710.59 and 12,860.72

Step by Step Solution

1. Step 1: Write the proportion equation
   8,710.59 : 12,860.72 = 12,860.72 : x
2. Step 2: Convert to fraction form
   8,710.59/12,860.72 = 12,860.72/x
3. Step 3: Cross multiply
   8,710.59x = 12,860.72 × 12,860.72
4. Step 4: Simplify right side
   8,710.59x = 165,398,086.77
5. Step 5: Solve for x
   x = 165,398,086.77/8,710.59
6. Step 6: Final answer
   x = 18,988.15