Finding the Fourth Proportional to 6,411.92, 8,856.30 and 4,640.72

Step by Step Solution

1. Step 1: Write the proportion equation
   6,411.92 : 8,856.30 = 4,640.72 : x
2. Step 2: Convert to fraction form
   6,411.92/8,856.30 = 4,640.72/x
3. Step 3: Cross multiply
   6,411.92x = 8,856.30 × 4,640.72
4. Step 4: Simplify right side
   6,411.92x = 41,099,608.54
5. Step 5: Solve for x
   x = 41,099,608.54/6,411.92
6. Step 6: Final answer
   x = 6,409.88