Finding the Fourth Proportional to 12,606.91, 17,402.29 and 9,911.09

Step by Step Solution

1. Step 1: Write the proportion equation
   12,606.91 : 17,402.29 = 9,911.09 : x
2. Step 2: Convert to fraction form
   12,606.91/17,402.29 = 9,911.09/x
3. Step 3: Cross multiply
   12,606.91x = 17,402.29 × 9,911.09
4. Step 4: Simplify right side
   12,606.91x = 172,475,662.40
5. Step 5: Solve for x
   x = 172,475,662.40/12,606.91
6. Step 6: Final answer
   x = 13,681.04