Finding the Fourth Proportional to 10,258.83, 14,149.77 and 9,915.78

Step by Step Solution

1. Step 1: Write the proportion equation
   10,258.83 : 14,149.77 = 9,915.78 : x
2. Step 2: Convert to fraction form
   10,258.83/14,149.77 = 9,915.78/x
3. Step 3: Cross multiply
   10,258.83x = 14,149.77 × 9,915.78
4. Step 4: Simplify right side
   10,258.83x = 140,306,006.37
5. Step 5: Solve for x
   x = 140,306,006.37/10,258.83
6. Step 6: Final answer
   x = 13,676.61