Finding the Fourth Proportional to 9,639.20, 13,302.43 and 5,660.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,639.20 : 13,302.43 = 5,660.23 : x
2. Step 2: Convert to fraction form
   9,639.20/13,302.43 = 5,660.23/x
3. Step 3: Cross multiply
   9,639.20x = 13,302.43 × 5,660.23
4. Step 4: Simplify right side
   9,639.20x = 75,294,790.89
5. Step 5: Solve for x
   x = 75,294,790.89/9,639.20
6. Step 6: Final answer
   x = 7,811.31