Finding the Fourth Proportional to 22,648.78, 31,255.73 and 12,578.15

Step by Step Solution

1. Step 1: Write the proportion equation
   22,648.78 : 31,255.73 = 12,578.15 : x
2. Step 2: Convert to fraction form
   22,648.78/31,255.73 = 12,578.15/x
3. Step 3: Cross multiply
   22,648.78x = 31,255.73 × 12,578.15
4. Step 4: Simplify right side
   22,648.78x = 393,139,437.29
5. Step 5: Solve for x
   x = 393,139,437.29/22,648.78
6. Step 6: Final answer
   x = 17,358.09