Finding the Fourth Proportional to 9,408.88, 12,981.30 and 5,429.47

Step by Step Solution

1. Step 1: Write the proportion equation
   9,408.88 : 12,981.30 = 5,429.47 : x
2. Step 2: Convert to fraction form
   9,408.88/12,981.30 = 5,429.47/x
3. Step 3: Cross multiply
   9,408.88x = 12,981.30 × 5,429.47
4. Step 4: Simplify right side
   9,408.88x = 70,481,578.91
5. Step 5: Solve for x
   x = 70,481,578.91/9,408.88
6. Step 6: Final answer
   x = 7,490.96