Finding the Fourth Proportional to 9,947.87, 13,728.35 and 5,471.91

Step by Step Solution

1. Step 1: Write the proportion equation
   9,947.87 : 13,728.35 = 5,471.91 : x
2. Step 2: Convert to fraction form
   9,947.87/13,728.35 = 5,471.91/x
3. Step 3: Cross multiply
   9,947.87x = 13,728.35 × 5,471.91
4. Step 4: Simplify right side
   9,947.87x = 75,120,295.65
5. Step 5: Solve for x
   x = 75,120,295.65/9,947.87
6. Step 6: Final answer
   x = 7,551.39