Finding the Fourth Proportional to 6,411.38, 9,608.70 and 3,639.29

Step by Step Solution

1. Step 1: Write the proportion equation
   6,411.38 : 9,608.70 = 3,639.29 : x
2. Step 2: Convert to fraction form
   6,411.38/9,608.70 = 3,639.29/x
3. Step 3: Cross multiply
   6,411.38x = 9,608.70 × 3,639.29
4. Step 4: Simplify right side
   6,411.38x = 34,968,845.82
5. Step 5: Solve for x
   x = 34,968,845.82/6,411.38
6. Step 6: Final answer
   x = 5,454.18