Finding the Fourth Proportional to 9,216.69, 12,718.62 and 5,238.17

Step by Step Solution

1. Step 1: Write the proportion equation
   9,216.69 : 12,718.62 = 5,238.17 : x
2. Step 2: Convert to fraction form
   9,216.69/12,718.62 = 5,238.17/x
3. Step 3: Cross multiply
   9,216.69x = 12,718.62 × 5,238.17
4. Step 4: Simplify right side
   9,216.69x = 66,622,277.83
5. Step 5: Solve for x
   x = 66,622,277.83/9,216.69
6. Step 6: Final answer
   x = 7,228.44