Finding the Fourth Proportional to 9,617.94, 13,272.81 and 5,639.12

Step by Step Solution

1. Step 1: Write the proportion equation
   9,617.94 : 13,272.81 = 5,639.12 : x
2. Step 2: Convert to fraction form
   9,617.94/13,272.81 = 5,639.12/x
3. Step 3: Cross multiply
   9,617.94x = 13,272.81 × 5,639.12
4. Step 4: Simplify right side
   9,617.94x = 74,846,962.31
5. Step 5: Solve for x
   x = 74,846,962.31/9,617.94
6. Step 6: Final answer
   x = 7,782.02