Finding the Fourth Proportional to 12,616.80, 17,401.91 and 8,138.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,616.80 : 17,401.91 = 8,138.31 : x
2. Step 2: Convert to fraction form
   12,616.80/17,401.91 = 8,138.31/x
3. Step 3: Cross multiply
   12,616.80x = 17,401.91 × 8,138.31
4. Step 4: Simplify right side
   12,616.80x = 141,622,097.48
5. Step 5: Solve for x
   x = 141,622,097.48/12,616.80
6. Step 6: Final answer
   x = 11,224.88