Finding the Fourth Proportional to 6,388.40, 8,812.39 and 3,835.50

Step by Step Solution

1. Step 1: Write the proportion equation
   6,388.40 : 8,812.39 = 3,835.50 : x
2. Step 2: Convert to fraction form
   6,388.40/8,812.39 = 3,835.50/x
3. Step 3: Cross multiply
   6,388.40x = 8,812.39 × 3,835.50
4. Step 4: Simplify right side
   6,388.40x = 33,799,902.67
5. Step 5: Solve for x
   x = 33,799,902.67/6,388.40
6. Step 6: Final answer
   x = 5,290.83