Finding the Fourth Proportional to 12,616.25, 17,284.34 and 12,143.31

Step by Step Solution

1. Step 1: Write the proportion equation
   12,616.25 : 17,284.34 = 12,143.31 : x
2. Step 2: Convert to fraction form
   12,616.25/17,284.34 = 12,143.31/x
3. Step 3: Cross multiply
   12,616.25x = 17,284.34 × 12,143.31
4. Step 4: Simplify right side
   12,616.25x = 209,889,038.05
5. Step 5: Solve for x
   x = 209,889,038.05/12,616.25
6. Step 6: Final answer
   x = 16,636.41