Finding the Fourth Proportional to 9,320.72, 12,862.68 and 5,129

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320.72 : 12,862.68 = 5,129 : x
2. Step 2: Convert to fraction form
   9,320.72/12,862.68 = 5,129/x
3. Step 3: Cross multiply
   9,320.72x = 12,862.68 × 5,129
4. Step 4: Simplify right side
   9,320.72x = 65,972,685.72
5. Step 5: Solve for x
   x = 65,972,685.72/9,320.72
6. Step 6: Final answer
   x = 7,078.07