Finding the Third Proportional to 8,128.69 and 12,124.69

Step by Step Solution

1. Step 1: Write the proportion equation
   8,128.69 : 12,124.69 = 12,124.69 : x
2. Step 2: Convert to fraction form
   8,128.69/12,124.69 = 12,124.69/x
3. Step 3: Cross multiply
   8,128.69x = 12,124.69 × 12,124.69
4. Step 4: Simplify right side
   8,128.69x = 147,008,046.97
5. Step 5: Solve for x
   x = 147,008,046.97/8,128.69
6. Step 6: Final answer
   x = 18,085.09