Finding the Fourth Proportional to 22,648.47, 31,256.86 and 12,578.87

Step by Step Solution

1. Step 1: Write the proportion equation
   22,648.47 : 31,256.86 = 12,578.87 : x
2. Step 2: Convert to fraction form
   22,648.47/31,256.86 = 12,578.87/x
3. Step 3: Cross multiply
   22,648.47x = 31,256.86 × 12,578.87
4. Step 4: Simplify right side
   22,648.47x = 393,175,978.55
5. Step 5: Solve for x
   x = 393,175,978.55/22,648.47
6. Step 6: Final answer
   x = 17,359.94