Finding the Fourth Proportional to 22,469.33, 31,009.10 and 12,912.28

Step by Step Solution

1. Step 1: Write the proportion equation
   22,469.33 : 31,009.10 = 12,912.28 : x
2. Step 2: Convert to fraction form
   22,469.33/31,009.10 = 12,912.28/x
3. Step 3: Cross multiply
   22,469.33x = 31,009.10 × 12,912.28
4. Step 4: Simplify right side
   22,469.33x = 400,398,039.66
5. Step 5: Solve for x
   x = 400,398,039.66/22,469.33
6. Step 6: Final answer
   x = 17,819.76