Finding the Fourth Proportional to 12,831.31, 17,705.41 and 7,165.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,831.31 : 17,705.41 = 7,165.27 : x
2. Step 2: Convert to fraction form
   12,831.31/17,705.41 = 7,165.27/x
3. Step 3: Cross multiply
   12,831.31x = 17,705.41 × 7,165.27
4. Step 4: Simplify right side
   12,831.31x = 126,864,043.11
5. Step 5: Solve for x
   x = 126,864,043.11/12,831.31
6. Step 6: Final answer
   x = 9,887.07