Finding the Fourth Proportional to 9,215.52, 12,722.08 and 5,439.82

Step by Step Solution

1. Step 1: Write the proportion equation
   9,215.52 : 12,722.08 = 5,439.82 : x
2. Step 2: Convert to fraction form
   9,215.52/12,722.08 = 5,439.82/x
3. Step 3: Cross multiply
   9,215.52x = 12,722.08 × 5,439.82
4. Step 4: Simplify right side
   9,215.52x = 69,205,825.23
5. Step 5: Solve for x
   x = 69,205,825.23/9,215.52
6. Step 6: Final answer
   x = 7,509.70