Finding the Fourth Proportional to 12,683.99, 17,508.56 and 7,648.43

Step by Step Solution

1. Step 1: Write the proportion equation
   12,683.99 : 17,508.56 = 7,648.43 : x
2. Step 2: Convert to fraction form
   12,683.99/17,508.56 = 7,648.43/x
3. Step 3: Cross multiply
   12,683.99x = 17,508.56 × 7,648.43
4. Step 4: Simplify right side
   12,683.99x = 133,912,869.78
5. Step 5: Solve for x
   x = 133,912,869.78/12,683.99
6. Step 6: Final answer
   x = 10,557.63