Finding the Fourth Proportional to 12,896.20, 19,345.29 and 5,500.72

Step by Step Solution

1. Step 1: Write the proportion equation
   12,896.20 : 19,345.29 = 5,500.72 : x
2. Step 2: Convert to fraction form
   12,896.20/19,345.29 = 5,500.72/x
3. Step 3: Cross multiply
   12,896.20x = 19,345.29 × 5,500.72
4. Step 4: Simplify right side
   12,896.20x = 106,413,023.61
5. Step 5: Solve for x
   x = 106,413,023.61/12,896.20
6. Step 6: Final answer
   x = 8,251.50