Finding the Fourth Proportional to 7,681.57, 10,643.38 and 7,515.49

Step by Step Solution

1. Step 1: Write the proportion equation
   7,681.57 : 10,643.38 = 7,515.49 : x
2. Step 2: Convert to fraction form
   7,681.57/10,643.38 = 7,515.49/x
3. Step 3: Cross multiply
   7,681.57x = 10,643.38 × 7,515.49
4. Step 4: Simplify right side
   7,681.57x = 79,990,215.96
5. Step 5: Solve for x
   x = 79,990,215.96/7,681.57
6. Step 6: Final answer
   x = 10,413.26