Finding the Fourth Proportional to 9,947.79, 13,728.29 and 5,471.73

Step by Step Solution

1. Step 1: Write the proportion equation
   9,947.79 : 13,728.29 = 5,471.73 : x
2. Step 2: Convert to fraction form
   9,947.79/13,728.29 = 5,471.73/x
3. Step 3: Cross multiply
   9,947.79x = 13,728.29 × 5,471.73
4. Step 4: Simplify right side
   9,947.79x = 75,117,468.88
5. Step 5: Solve for x
   x = 75,117,468.88/9,947.79
6. Step 6: Final answer
   x = 7,551.17