Finding the Fourth Proportional to 12,721.32, 17,556.50 and 7,057.89

Step by Step Solution

1. Step 1: Write the proportion equation
   12,721.32 : 17,556.50 = 7,057.89 : x
2. Step 2: Convert to fraction form
   12,721.32/17,556.50 = 7,057.89/x
3. Step 3: Cross multiply
   12,721.32x = 17,556.50 × 7,057.89
4. Step 4: Simplify right side
   12,721.32x = 123,911,896.35
5. Step 5: Solve for x
   x = 123,911,896.35/12,721.32
6. Step 6: Final answer
   x = 9,740.49