Finding the Fourth Proportional to 9,884.39, 13,639.86 and 5,408.15

Step by Step Solution

1. Step 1: Write the proportion equation
   9,884.39 : 13,639.86 = 5,408.15 : x
2. Step 2: Convert to fraction form
   9,884.39/13,639.86 = 5,408.15/x
3. Step 3: Cross multiply
   9,884.39x = 13,639.86 × 5,408.15
4. Step 4: Simplify right side
   9,884.39x = 73,766,340.66
5. Step 5: Solve for x
   x = 73,766,340.66/9,884.39
6. Step 6: Final answer
   x = 7,462.92