Finding the Fourth Proportional to 9,408.85, 12,985.91 and 5,429.41

Step by Step Solution

1. Step 1: Write the proportion equation
   9,408.85 : 12,985.91 = 5,429.41 : x
2. Step 2: Convert to fraction form
   9,408.85/12,985.91 = 5,429.41/x
3. Step 3: Cross multiply
   9,408.85x = 12,985.91 × 5,429.41
4. Step 4: Simplify right side
   9,408.85x = 70,505,802.47
5. Step 5: Solve for x
   x = 70,505,802.47/9,408.85
6. Step 6: Final answer
   x = 7,493.56