Finding the Fourth Proportional to 13,029.48, 17,980.25 and 7,721.15

Step by Step Solution

1. Step 1: Write the proportion equation
   13,029.48 : 17,980.25 = 7,721.15 : x
2. Step 2: Convert to fraction form
   13,029.48/17,980.25 = 7,721.15/x
3. Step 3: Cross multiply
   13,029.48x = 17,980.25 × 7,721.15
4. Step 4: Simplify right side
   13,029.48x = 138,828,078.78
5. Step 5: Solve for x
   x = 138,828,078.78/13,029.48
6. Step 6: Final answer
   x = 10,654.92