Finding the Fourth Proportional to 12,722.78, 17,556.81 and 7,057.46

Step by Step Solution

1. Step 1: Write the proportion equation
   12,722.78 : 17,556.81 = 7,057.46 : x
2. Step 2: Convert to fraction form
   12,722.78/17,556.81 = 7,057.46/x
3. Step 3: Cross multiply
   12,722.78x = 17,556.81 × 7,057.46
4. Step 4: Simplify right side
   12,722.78x = 123,906,484.30
5. Step 5: Solve for x
   x = 123,906,484.30/12,722.78
6. Step 6: Final answer
   x = 9,738.95