Finding the Fourth Proportional to 7,321.25, 10,107.92 and 5,639.49

Step by Step Solution

1. Step 1: Write the proportion equation
   7,321.25 : 10,107.92 = 5,639.49 : x
2. Step 2: Convert to fraction form
   7,321.25/10,107.92 = 5,639.49/x
3. Step 3: Cross multiply
   7,321.25x = 10,107.92 × 5,639.49
4. Step 4: Simplify right side
   7,321.25x = 57,003,527.86
5. Step 5: Solve for x
   x = 57,003,527.86/7,321.25
6. Step 6: Final answer
   x = 7,786.03