Finding the Fourth Proportional to 22,139.62, 30,551.55 and 12,578.25

Step by Step Solution

1. Step 1: Write the proportion equation
   22,139.62 : 30,551.55 = 12,578.25 : x
2. Step 2: Convert to fraction form
   22,139.62/30,551.55 = 12,578.25/x
3. Step 3: Cross multiply
   22,139.62x = 30,551.55 × 12,578.25
4. Step 4: Simplify right side
   22,139.62x = 384,285,078.43
5. Step 5: Solve for x
   x = 384,285,078.43/22,139.62
6. Step 6: Final answer
   x = 17,357.35