Finding the Fourth Proportional to 9,391.88, 12,960.61 and 5,412.76

Step by Step Solution

1. Step 1: Write the proportion equation
   9,391.88 : 12,960.61 = 5,412.76 : x
2. Step 2: Convert to fraction form
   9,391.88/12,960.61 = 5,412.76/x
3. Step 3: Cross multiply
   9,391.88x = 12,960.61 × 5,412.76
4. Step 4: Simplify right side
   9,391.88x = 70,152,625.45
5. Step 5: Solve for x
   x = 70,152,625.45/9,391.88
6. Step 6: Final answer
   x = 7,469.50