Finding the Fourth Proportional to 9,320.82, 12,862.72 and 5,129.07

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320.82 : 12,862.72 = 5,129.07 : x
2. Step 2: Convert to fraction form
   9,320.82/12,862.72 = 5,129.07/x
3. Step 3: Cross multiply
   9,320.82x = 12,862.72 × 5,129.07
4. Step 4: Simplify right side
   9,320.82x = 65,973,726.96
5. Step 5: Solve for x
   x = 65,973,726.96/9,320.82
6. Step 6: Final answer
   x = 7,078.11