Finding the Fourth Proportional to 12,320.28, 17,005.56 and 7,017.96

Step by Step Solution

1. Step 1: Write the proportion equation
   12,320.28 : 17,005.56 = 7,017.96 : x
2. Step 2: Convert to fraction form
   12,320.28/17,005.56 = 7,017.96/x
3. Step 3: Cross multiply
   12,320.28x = 17,005.56 × 7,017.96
4. Step 4: Simplify right side
   12,320.28x = 119,344,339.86
5. Step 5: Solve for x
   x = 119,344,339.86/12,320.28
6. Step 6: Final answer
   x = 9,686.82