Finding the Fourth Proportional to 9,223.18, 12,730.01 and 5,639.39

Step by Step Solution

1. Step 1: Write the proportion equation
   9,223.18 : 12,730.01 = 5,639.39 : x
2. Step 2: Convert to fraction form
   9,223.18/12,730.01 = 5,639.39/x
3. Step 3: Cross multiply
   9,223.18x = 12,730.01 × 5,639.39
4. Step 4: Simplify right side
   9,223.18x = 71,789,491.09
5. Step 5: Solve for x
   x = 71,789,491.09/9,223.18
6. Step 6: Final answer
   x = 7,783.59