Finding the Third Proportional to 8,290.50 and 12,856.13

Step by Step Solution

1. Step 1: Write the proportion equation
   8,290.50 : 12,856.13 = 12,856.13 : x
2. Step 2: Convert to fraction form
   8,290.50/12,856.13 = 12,856.13/x
3. Step 3: Cross multiply
   8,290.50x = 12,856.13 × 12,856.13
4. Step 4: Simplify right side
   8,290.50x = 165,279,950.02
5. Step 5: Solve for x
   x = 165,279,950.02/8,290.50
6. Step 6: Final answer
   x = 19,936.07