Finding the Third Proportional to 8,429.63 and 11,809.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8,429.63 : 11,809.69 = 11,809.69 : x
2. Step 2: Convert to fraction form
   8,429.63/11,809.69 = 11,809.69/x
3. Step 3: Cross multiply
   8,429.63x = 11,809.69 × 11,809.69
4. Step 4: Simplify right side
   8,429.63x = 139,468,718.85
5. Step 5: Solve for x
   x = 139,468,718.85/8,429.63
6. Step 6: Final answer
   x = 16,545.07