Finding the Fourth Proportional to 12,722.20, 17,556.52 and 7,057

Step by Step Solution

1. Step 1: Write the proportion equation
   12,722.20 : 17,556.52 = 7,057 : x
2. Step 2: Convert to fraction form
   12,722.20/17,556.52 = 7,057/x
3. Step 3: Cross multiply
   12,722.20x = 17,556.52 × 7,057
4. Step 4: Simplify right side
   12,722.20x = 123,896,361.64
5. Step 5: Solve for x
   x = 123,896,361.64/12,722.20
6. Step 6: Final answer
   x = 9,738.60