Finding the Fourth Proportional to 12,422.92, 17,142.24 and 7,116.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,422.92 : 17,142.24 = 7,116.28 : x
2. Step 2: Convert to fraction form
   12,422.92/17,142.24 = 7,116.28/x
3. Step 3: Cross multiply
   12,422.92x = 17,142.24 × 7,116.28
4. Step 4: Simplify right side
   12,422.92x = 121,988,979.67
5. Step 5: Solve for x
   x = 121,988,979.67/12,422.92
6. Step 6: Final answer
   x = 9,819.67