Finding the Fourth Proportional to 9,339.57, 12,890.34 and 5,306.38

Step by Step Solution

1. Step 1: Write the proportion equation
   9,339.57 : 12,890.34 = 5,306.38 : x
2. Step 2: Convert to fraction form
   9,339.57/12,890.34 = 5,306.38/x
3. Step 3: Cross multiply
   9,339.57x = 12,890.34 × 5,306.38
4. Step 4: Simplify right side
   9,339.57x = 68,401,042.37
5. Step 5: Solve for x
   x = 68,401,042.37/9,339.57
6. Step 6: Final answer
   x = 7,323.79