Finding the Fourth Proportional to 9,058.78, 12,498.75 and 5,229.48

Step by Step Solution

1. Step 1: Write the proportion equation
   9,058.78 : 12,498.75 = 5,229.48 : x
2. Step 2: Convert to fraction form
   9,058.78/12,498.75 = 5,229.48/x
3. Step 3: Cross multiply
   9,058.78x = 12,498.75 × 5,229.48
4. Step 4: Simplify right side
   9,058.78x = 65,361,963.15
5. Step 5: Solve for x
   x = 65,361,963.15/9,058.78
6. Step 6: Final answer
   x = 7,215.32