Finding the Fourth Proportional to 9,320.68, 12,862.56 and 5,129.20

Step by Step Solution

1. Step 1: Write the proportion equation
   9,320.68 : 12,862.56 = 5,129.20 : x
2. Step 2: Convert to fraction form
   9,320.68/12,862.56 = 5,129.20/x
3. Step 3: Cross multiply
   9,320.68x = 12,862.56 × 5,129.20
4. Step 4: Simplify right side
   9,320.68x = 65,974,642.75
5. Step 5: Solve for x
   x = 65,974,642.75/9,320.68
6. Step 6: Final answer
   x = 7,078.31