Finding the Fourth Proportional to 9,947.89, 13,728.31 and 5,472.03

Step by Step Solution

1. Step 1: Write the proportion equation
   9,947.89 : 13,728.31 = 5,472.03 : x
2. Step 2: Convert to fraction form
   9,947.89/13,728.31 = 5,472.03/x
3. Step 3: Cross multiply
   9,947.89x = 13,728.31 × 5,472.03
4. Step 4: Simplify right side
   9,947.89x = 75,121,710.49
5. Step 5: Solve for x
   x = 75,121,710.49/9,947.89
6. Step 6: Final answer
   x = 7,551.52