Finding the Fourth Proportional to 9,408.94, 12,984.50 and 5,160.42

Step by Step Solution

1. Step 1: Write the proportion equation
   9,408.94 : 12,984.50 = 5,160.42 : x
2. Step 2: Convert to fraction form
   9,408.94/12,984.50 = 5,160.42/x
3. Step 3: Cross multiply
   9,408.94x = 12,984.50 × 5,160.42
4. Step 4: Simplify right side
   9,408.94x = 67,005,473.49
5. Step 5: Solve for x
   x = 67,005,473.49/9,408.94
6. Step 6: Final answer
   x = 7,121.47