Finding the Fourth Proportional to 22,128.72, 30,522.46 and 13,169.31

Step by Step Solution

1. Step 1: Write the proportion equation
   22,128.72 : 30,522.46 = 13,169.31 : x
2. Step 2: Convert to fraction form
   22,128.72/30,522.46 = 13,169.31/x
3. Step 3: Cross multiply
   22,128.72x = 30,522.46 × 13,169.31
4. Step 4: Simplify right side
   22,128.72x = 401,959,737.70
5. Step 5: Solve for x
   x = 401,959,737.70/22,128.72
6. Step 6: Final answer
   x = 18,164.62