Finding the Fourth Proportional to 12,339.72, 17,022.90 and 7,622.28

Step by Step Solution

1. Step 1: Write the proportion equation
   12,339.72 : 17,022.90 = 7,622.28 : x
2. Step 2: Convert to fraction form
   12,339.72/17,022.90 = 7,622.28/x
3. Step 3: Cross multiply
   12,339.72x = 17,022.90 × 7,622.28
4. Step 4: Simplify right side
   12,339.72x = 129,753,310.21
5. Step 5: Solve for x
   x = 129,753,310.21/12,339.72
6. Step 6: Final answer
   x = 10,515.09