Finding the Fourth Proportional to 9,046.89, 12,481.49 and 7,158.78

Step by Step Solution

1. Step 1: Write the proportion equation
   9,046.89 : 12,481.49 = 7,158.78 : x
2. Step 2: Convert to fraction form
   9,046.89/12,481.49 = 7,158.78/x
3. Step 3: Cross multiply
   9,046.89x = 12,481.49 × 7,158.78
4. Step 4: Simplify right side
   9,046.89x = 89,352,258.88
5. Step 5: Solve for x
   x = 89,352,258.88/9,046.89
6. Step 6: Final answer
   x = 9,876.57