Finding the Fourth Proportional to 12,809.08, 17,678.04 and 7,144.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,809.08 : 17,678.04 = 7,144.72 : x
2. Step 2: Convert to fraction form
   12,809.08/17,678.04 = 7,144.72/x
3. Step 3: Cross multiply
   12,809.08x = 17,678.04 × 7,144.72
4. Step 4: Simplify right side
   12,809.08x = 126,304,645.95
5. Step 5: Solve for x
   x = 126,304,645.95/12,809.08
6. Step 6: Final answer
   x = 9,860.56