Finding the Fourth Proportional to 12,920.72, 19,371.96 and 6,342.71

Step by Step Solution

1. Step 1: Write the proportion equation
   12,920.72 : 19,371.96 = 6,342.71 : x
2. Step 2: Convert to fraction form
   12,920.72/19,371.96 = 6,342.71/x
3. Step 3: Cross multiply
   12,920.72x = 19,371.96 × 6,342.71
4. Step 4: Simplify right side
   12,920.72x = 122,870,627.55
5. Step 5: Solve for x
   x = 122,870,627.55/12,920.72
6. Step 6: Final answer
   x = 9,509.58