Finding the Fourth Proportional to 9,383.87, 12,949.31 and 5,405.55

Step by Step Solution

1. Step 1: Write the proportion equation
   9,383.87 : 12,949.31 = 5,405.55 : x
2. Step 2: Convert to fraction form
   9,383.87/12,949.31 = 5,405.55/x
3. Step 3: Cross multiply
   9,383.87x = 12,949.31 × 5,405.55
4. Step 4: Simplify right side
   9,383.87x = 69,998,115.64
5. Step 5: Solve for x
   x = 69,998,115.64/9,383.87
6. Step 6: Final answer
   x = 7,459.41