Finding the Fourth Proportional to 9,639.54, 13,301.37 and 5,390.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,639.54 : 13,301.37 = 5,390.82 : x
2. Step 2: Convert to fraction form
   9,639.54/13,301.37 = 5,390.82/x
3. Step 3: Cross multiply
   9,639.54x = 13,301.37 × 5,390.82
4. Step 4: Simplify right side
   9,639.54x = 71,705,291.42
5. Step 5: Solve for x
   x = 71,705,291.42/9,639.54
6. Step 6: Final answer
   x = 7,438.66