Finding the Fourth Proportional to 12,417.88, 17,139.12 and 7,116.24

Step by Step Solution

1. Step 1: Write the proportion equation
   12,417.88 : 17,139.12 = 7,116.24 : x
2. Step 2: Convert to fraction form
   12,417.88/17,139.12 = 7,116.24/x
3. Step 3: Cross multiply
   12,417.88x = 17,139.12 × 7,116.24
4. Step 4: Simplify right side
   12,417.88x = 121,966,091.31
5. Step 5: Solve for x
   x = 121,966,091.31/12,417.88
6. Step 6: Final answer
   x = 9,821.81