Finding the Fourth Proportional to 9,639.38, 13,309.89 and 7,397.71

Step by Step Solution

1. Step 1: Write the proportion equation
   9,639.38 : 13,309.89 = 7,397.71 : x
2. Step 2: Convert to fraction form
   9,639.38/13,309.89 = 7,397.71/x
3. Step 3: Cross multiply
   9,639.38x = 13,309.89 × 7,397.71
4. Step 4: Simplify right side
   9,639.38x = 98,462,645.34
5. Step 5: Solve for x
   x = 98,462,645.34/9,639.38
6. Step 6: Final answer
   x = 10,214.62