Finding the Third Proportional to 8,911.69 and 19,661.91

Step by Step Solution

1. Step 1: Write the proportion equation
   8,911.69 : 19,661.91 = 19,661.91 : x
2. Step 2: Convert to fraction form
   8,911.69/19,661.91 = 19,661.91/x
3. Step 3: Cross multiply
   8,911.69x = 19,661.91 × 19,661.91
4. Step 4: Simplify right side
   8,911.69x = 386,590,557.38
5. Step 5: Solve for x
   x = 386,590,557.38/8,911.69
6. Step 6: Final answer
   x = 43,380.17