Finding the Fourth Proportional to 12,979.80, 17,900.17 and 8,665.27

Step by Step Solution

1. Step 1: Write the proportion equation
   12,979.80 : 17,900.17 = 8,665.27 : x
2. Step 2: Convert to fraction form
   12,979.80/17,900.17 = 8,665.27/x
3. Step 3: Cross multiply
   12,979.80x = 17,900.17 × 8,665.27
4. Step 4: Simplify right side
   12,979.80x = 155,109,739.68
5. Step 5: Solve for x
   x = 155,109,739.68/12,979.80
6. Step 6: Final answer
   x = 11,950.09