Finding the Fourth Proportional to 9,408.24, 12,981.27 and 5,429.10

Step by Step Solution

1. Step 1: Write the proportion equation
   9,408.24 : 12,981.27 = 5,429.10 : x
2. Step 2: Convert to fraction form
   9,408.24/12,981.27 = 5,429.10/x
3. Step 3: Cross multiply
   9,408.24x = 12,981.27 × 5,429.10
4. Step 4: Simplify right side
   9,408.24x = 70,476,612.96
5. Step 5: Solve for x
   x = 70,476,612.96/9,408.24
6. Step 6: Final answer
   x = 7,490.95