Finding the Fourth Proportional to 6,647.31, 9,951.63 and 3,865.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,647.31 : 9,951.63 = 3,865.50 : x
2. Step 2: Convert to fraction form
   6,647.31/9,951.63 = 3,865.50/x
3. Step 3: Cross multiply
   6,647.31x = 9,951.63 × 3,865.50
4. Step 4: Simplify right side
   6,647.31x = 38,468,025.77
5. Step 5: Solve for x
   x = 38,468,025.77/6,647.31
6. Step 6: Final answer
   x = 5,787.01