Finding the Fourth Proportional to 12,687.29, 17,508.10 and 7,022.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,687.29 : 17,508.10 = 7,022.27 : x
2. Step 2: Convert to fraction form
   12,687.29/17,508.10 = 7,022.27/x
3. Step 3: Cross multiply
   12,687.29x = 17,508.10 × 7,022.27
4. Step 4: Simplify right side
   12,687.29x = 122,946,605.39
5. Step 5: Solve for x
   x = 122,946,605.39/12,687.29
6. Step 6: Final answer
   x = 9,690.53