Finding the Fourth Proportional to 7,208.72, 9,947.98 and 4,223.92

Step by Step Solution

1. Step 1: Write the proportion equation
   7,208.72 : 9,947.98 = 4,223.92 : x
2. Step 2: Convert to fraction form
   7,208.72/9,947.98 = 4,223.92/x
3. Step 3: Cross multiply
   7,208.72x = 9,947.98 × 4,223.92
4. Step 4: Simplify right side
   7,208.72x = 42,019,471.68
5. Step 5: Solve for x
   x = 42,019,471.68/7,208.72
6. Step 6: Final answer
   x = 5,828.98