Finding the Fourth Proportional to 12,722.50, 17,555.20 and 7,057.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,722.50 : 17,555.20 = 7,057.27 : x
2. Step 2: Convert to fraction form
   12,722.50/17,555.20 = 7,057.27/x
3. Step 3: Cross multiply
   12,722.50x = 17,555.20 × 7,057.27
4. Step 4: Simplify right side
   12,722.50x = 123,891,786.30
5. Step 5: Solve for x
   x = 123,891,786.30/12,722.50
6. Step 6: Final answer
   x = 9,738.01