Finding the Third Proportional to 8,457 and 13,039.50

Step by Step Solution

1. Step 1: Write the proportion equation
   8,457 : 13,039.50 = 13,039.50 : x
2. Step 2: Convert to fraction form
   8,457/13,039.50 = 13,039.50/x
3. Step 3: Cross multiply
   8,457x = 13,039.50 × 13,039.50
4. Step 4: Simplify right side
   8,457x = 170,028,560.25
5. Step 5: Solve for x
   x = 170,028,560.25/8,457
6. Step 6: Final answer
   x = 20,105.07