Finding the Fourth Proportional to 9,945.20, 13,724.28 and 5,469

Step by Step Solution

1. Step 1: Write the proportion equation
   9,945.20 : 13,724.28 = 5,469 : x
2. Step 2: Convert to fraction form
   9,945.20/13,724.28 = 5,469/x
3. Step 3: Cross multiply
   9,945.20x = 13,724.28 × 5,469
4. Step 4: Simplify right side
   9,945.20x = 75,058,087.32
5. Step 5: Solve for x
   x = 75,058,087.32/9,945.20
6. Step 6: Final answer
   x = 7,547.17