Finding the Fourth Proportional to 9,728.49, 13,424.31 and 5,478.87

Step by Step Solution

1. Step 1: Write the proportion equation
   9,728.49 : 13,424.31 = 5,478.87 : x
2. Step 2: Convert to fraction form
   9,728.49/13,424.31 = 5,478.87/x
3. Step 3: Cross multiply
   9,728.49x = 13,424.31 × 5,478.87
4. Step 4: Simplify right side
   9,728.49x = 73,550,049.33
5. Step 5: Solve for x
   x = 73,550,049.33/9,728.49
6. Step 6: Final answer
   x = 7,560.27