Finding the Fourth Proportional to 9,217.50, 12,721.11 and 5,680.62

Step by Step Solution

1. Step 1: Write the proportion equation
   9,217.50 : 12,721.11 = 5,680.62 : x
2. Step 2: Convert to fraction form
   9,217.50/12,721.11 = 5,680.62/x
3. Step 3: Cross multiply
   9,217.50x = 12,721.11 × 5,680.62
4. Step 4: Simplify right side
   9,217.50x = 72,263,791.89
5. Step 5: Solve for x
   x = 72,263,791.89/9,217.50
6. Step 6: Final answer
   x = 7,839.85