Finding the Fourth Proportional to 9,078.86, 12,521.30 and 7,665.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,078.86 : 12,521.30 = 7,665.82 : x
2. Step 2: Convert to fraction form
   9,078.86/12,521.30 = 7,665.82/x
3. Step 3: Cross multiply
   9,078.86x = 12,521.30 × 7,665.82
4. Step 4: Simplify right side
   9,078.86x = 95,986,031.97
5. Step 5: Solve for x
   x = 95,986,031.97/9,078.86
6. Step 6: Final answer
   x = 10,572.48