Finding the Fourth Proportional to 9,945.70, 13,724.96 and 5,469.50

Step by Step Solution

1. Step 1: Write the proportion equation
   9,945.70 : 13,724.96 = 5,469.50 : x
2. Step 2: Convert to fraction form
   9,945.70/13,724.96 = 5,469.50/x
3. Step 3: Cross multiply
   9,945.70x = 13,724.96 × 5,469.50
4. Step 4: Simplify right side
   9,945.70x = 75,068,668.72
5. Step 5: Solve for x
   x = 75,068,668.72/9,945.70
6. Step 6: Final answer
   x = 7,547.85