Finding the Fourth Proportional to 22,429.31, 33,612.23 and 12,438.47

Step by Step Solution

1. Step 1: Write the proportion equation
   22,429.31 : 33,612.23 = 12,438.47 : x
2. Step 2: Convert to fraction form
   22,429.31/33,612.23 = 12,438.47/x
3. Step 3: Cross multiply
   22,429.31x = 33,612.23 × 12,438.47
4. Step 4: Simplify right side
   22,429.31x = 418,084,829.61
5. Step 5: Solve for x
   x = 418,084,829.61/22,429.31
6. Step 6: Final answer
   x = 18,640.12