Finding the Fourth Proportional to 8,256.79, 12,366.15 and 6,401.89

Step by Step Solution

1. Step 1: Write the proportion equation
   8,256.79 : 12,366.15 = 6,401.89 : x
2. Step 2: Convert to fraction form
   8,256.79/12,366.15 = 6,401.89/x
3. Step 3: Cross multiply
   8,256.79x = 12,366.15 × 6,401.89
4. Step 4: Simplify right side
   8,256.79x = 79,166,732.02
5. Step 5: Solve for x
   x = 79,166,732.02/8,256.79
6. Step 6: Final answer
   x = 9,588.08