Finding the Fourth Proportional to 12,209.17, 16,843.89 and 7,965.22

Step by Step Solution

1. Step 1: Write the proportion equation
   12,209.17 : 16,843.89 = 7,965.22 : x
2. Step 2: Convert to fraction form
   12,209.17/16,843.89 = 7,965.22/x
3. Step 3: Cross multiply
   12,209.17x = 16,843.89 × 7,965.22
4. Step 4: Simplify right side
   12,209.17x = 134,165,289.51
5. Step 5: Solve for x
   x = 134,165,289.51/12,209.17
6. Step 6: Final answer
   x = 10,988.90