Finding the Fourth Proportional to 6,289.71, 8,679.83 and 3,933.20

Step by Step Solution

1. Step 1: Write the proportion equation
   6,289.71 : 8,679.83 = 3,933.20 : x
2. Step 2: Convert to fraction form
   6,289.71/8,679.83 = 3,933.20/x
3. Step 3: Cross multiply
   6,289.71x = 8,679.83 × 3,933.20
4. Step 4: Simplify right side
   6,289.71x = 34,139,444.29
5. Step 5: Solve for x
   x = 34,139,444.29/6,289.71
6. Step 6: Final answer
   x = 5,427.82