Finding the Fourth Proportional to 9,390.94, 12,960.87 and 5,411.95

Step by Step Solution

1. Step 1: Write the proportion equation
   9,390.94 : 12,960.87 = 5,411.95 : x
2. Step 2: Convert to fraction form
   9,390.94/12,960.87 = 5,411.95/x
3. Step 3: Cross multiply
   9,390.94x = 12,960.87 × 5,411.95
4. Step 4: Simplify right side
   9,390.94x = 70,143,580.40
5. Step 5: Solve for x
   x = 70,143,580.40/9,390.94
6. Step 6: Final answer
   x = 7,469.28