Finding the Fourth Proportional to 9,411.28, 12,987.24 and 5,219.92

Step by Step Solution

1. Step 1: Write the proportion equation
   9,411.28 : 12,987.24 = 5,219.92 : x
2. Step 2: Convert to fraction form
   9,411.28/12,987.24 = 5,219.92/x
3. Step 3: Cross multiply
   9,411.28x = 12,987.24 × 5,219.92
4. Step 4: Simplify right side
   9,411.28x = 67,792,353.82
5. Step 5: Solve for x
   x = 67,792,353.82/9,411.28
6. Step 6: Final answer
   x = 7,203.31