Finding the Fourth Proportional to 9,215.01, 12,721.38 and 5,439.33

Step by Step Solution

1. Step 1: Write the proportion equation
   9,215.01 : 12,721.38 = 5,439.33 : x
2. Step 2: Convert to fraction form
   9,215.01/12,721.38 = 5,439.33/x
3. Step 3: Cross multiply
   9,215.01x = 12,721.38 × 5,439.33
4. Step 4: Simplify right side
   9,215.01x = 69,195,783.88
5. Step 5: Solve for x
   x = 69,195,783.88/9,215.01
6. Step 6: Final answer
   x = 7,509.03