Finding the Fourth Proportional to 9,399.72, 12,988.72 and 8,944.23

Step by Step Solution

1. Step 1: Write the proportion equation
   9,399.72 : 12,988.72 = 8,944.23 : x
2. Step 2: Convert to fraction form
   9,399.72/12,988.72 = 8,944.23/x
3. Step 3: Cross multiply
   9,399.72x = 12,988.72 × 8,944.23
4. Step 4: Simplify right side
   9,399.72x = 116,174,028.02
5. Step 5: Solve for x
   x = 116,174,028.02/9,399.72
6. Step 6: Final answer
   x = 12,359.31