Finding the Fourth Proportional to 9,216.72, 12,720.63 and 5,440.83

Step by Step Solution

1. Step 1: Write the proportion equation
   9,216.72 : 12,720.63 = 5,440.83 : x
2. Step 2: Convert to fraction form
   9,216.72/12,720.63 = 5,440.83/x
3. Step 3: Cross multiply
   9,216.72x = 12,720.63 × 5,440.83
4. Step 4: Simplify right side
   9,216.72x = 69,210,785.32
5. Step 5: Solve for x
   x = 69,210,785.32/9,216.72
6. Step 6: Final answer
   x = 7,509.26