Finding the Fourth Proportional to 9,391.50, 12,960.09 and 5,412.39

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.50 : 12,960.09 = 5,412.39 : x
2. Step 2: Convert to fraction form
   9,391.50/12,960.09 = 5,412.39/x
3. Step 3: Cross multiply
   9,391.50x = 12,960.09 × 5,412.39
4. Step 4: Simplify right side
   9,391.50x = 70,145,061.52
5. Step 5: Solve for x
   x = 70,145,061.52/9,391.50
6. Step 6: Final answer
   x = 7,468.99