Finding the Fourth Proportional to 6,385.94, 8,809.89 and 3,900.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,385.94 : 8,809.89 = 3,900.50 : x
2. Step 2: Convert to fraction form
   6,385.94/8,809.89 = 3,900.50/x
3. Step 3: Cross multiply
   6,385.94x = 8,809.89 × 3,900.50
4. Step 4: Simplify right side
   6,385.94x = 34,362,975.95
5. Step 5: Solve for x
   x = 34,362,975.95/6,385.94
6. Step 6: Final answer
   x = 5,381.04