Finding the Fourth Proportional to 6,439.89, 8,885.67 and 3,786.33

Step by Step Solution

1. Step 1: Write the proportion equation
   6,439.89 : 8,885.67 = 3,786.33 : x
2. Step 2: Convert to fraction form
   6,439.89/8,885.67 = 3,786.33/x
3. Step 3: Cross multiply
   6,439.89x = 8,885.67 × 3,786.33
4. Step 4: Simplify right side
   6,439.89x = 33,644,078.89
5. Step 5: Solve for x
   x = 33,644,078.89/6,439.89
6. Step 6: Final answer
   x = 5,224.33