Finding the Fourth Proportional to 6,289.21, 8,679.18 and 3,456.89

Step by Step Solution

1. Step 1: Write the proportion equation
   6,289.21 : 8,679.18 = 3,456.89 : x
2. Step 2: Convert to fraction form
   6,289.21/8,679.18 = 3,456.89/x
3. Step 3: Cross multiply
   6,289.21x = 8,679.18 × 3,456.89
4. Step 4: Simplify right side
   6,289.21x = 30,002,957.49
5. Step 5: Solve for x
   x = 30,002,957.49/6,289.21
6. Step 6: Final answer
   x = 4,770.55