Finding the Fourth Proportional to 22,578.05, 31,156.34 and 12,505.91

Step by Step Solution

1. Step 1: Write the proportion equation
   22,578.05 : 31,156.34 = 12,505.91 : x
2. Step 2: Convert to fraction form
   22,578.05/31,156.34 = 12,505.91/x
3. Step 3: Cross multiply
   22,578.05x = 31,156.34 × 12,505.91
4. Step 4: Simplify right side
   22,578.05x = 389,638,165.66
5. Step 5: Solve for x
   x = 389,638,165.66/22,578.05
6. Step 6: Final answer
   x = 17,257.39