Finding the Fourth Proportional to 12,196.43, 16,831.40 and 6,891.12

Step by Step Solution

1. Step 1: Write the proportion equation
   12,196.43 : 16,831.40 = 6,891.12 : x
2. Step 2: Convert to fraction form
   12,196.43/16,831.40 = 6,891.12/x
3. Step 3: Cross multiply
   12,196.43x = 16,831.40 × 6,891.12
4. Step 4: Simplify right side
   12,196.43x = 115,987,162.71
5. Step 5: Solve for x
   x = 115,987,162.71/12,196.43
6. Step 6: Final answer
   x = 9,509.93