Finding the Fourth Proportional to 9,315.59, 12,857.33 and 5,339.36

Step by Step Solution

1. Step 1: Write the proportion equation
   9,315.59 : 12,857.33 = 5,339.36 : x
2. Step 2: Convert to fraction form
   9,315.59/12,857.33 = 5,339.36/x
3. Step 3: Cross multiply
   9,315.59x = 12,857.33 × 5,339.36
4. Step 4: Simplify right side
   9,315.59x = 68,649,959.00
5. Step 5: Solve for x
   x = 68,649,959.00/9,315.59
6. Step 6: Final answer
   x = 7,369.37