Finding the Third Proportional to 8,406.28 and 12,620.81

Step by Step Solution

1. Step 1: Write the proportion equation
   8,406.28 : 12,620.81 = 12,620.81 : x
2. Step 2: Convert to fraction form
   8,406.28/12,620.81 = 12,620.81/x
3. Step 3: Cross multiply
   8,406.28x = 12,620.81 × 12,620.81
4. Step 4: Simplify right side
   8,406.28x = 159,284,908.16
5. Step 5: Solve for x
   x = 159,284,908.16/8,406.28
6. Step 6: Final answer
   x = 18,948.32