Finding the Fourth Proportional to 12,809.03, 17,676.43 and 7,143.79

Step by Step Solution

1. Step 1: Write the proportion equation
   12,809.03 : 17,676.43 = 7,143.79 : x
2. Step 2: Convert to fraction form
   12,809.03/17,676.43 = 7,143.79/x
3. Step 3: Cross multiply
   12,809.03x = 17,676.43 × 7,143.79
4. Step 4: Simplify right side
   12,809.03x = 126,276,641.82
5. Step 5: Solve for x
   x = 126,276,641.82/12,809.03
6. Step 6: Final answer
   x = 9,858.41