Finding the Fourth Proportional to 22,315.27, 33,470.01 and 12,960.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,315.27 : 33,470.01 = 12,960.31 : x
2. Step 2: Convert to fraction form
   22,315.27/33,470.01 = 12,960.31/x
3. Step 3: Cross multiply
   22,315.27x = 33,470.01 × 12,960.31
4. Step 4: Simplify right side
   22,315.27x = 433,781,705.30
5. Step 5: Solve for x
   x = 433,781,705.30/22,315.27
6. Step 6: Final answer
   x = 19,438.78