Finding the Fourth Proportional to 22,649.69, 31,255.51 and 12,578.78

Step by Step Solution

1. Step 1: Write the proportion equation
   22,649.69 : 31,255.51 = 12,578.78 : x
2. Step 2: Convert to fraction form
   22,649.69/31,255.51 = 12,578.78/x
3. Step 3: Cross multiply
   22,649.69x = 31,255.51 × 12,578.78
4. Step 4: Simplify right side
   22,649.69x = 393,155,996.35
5. Step 5: Solve for x
   x = 393,155,996.35/22,649.69
6. Step 6: Final answer
   x = 17,358.12