Finding the Fourth Proportional to 6,423.72, 8,864.70 and 3,591.09

Step by Step Solution

1. Step 1: Write the proportion equation
   6,423.72 : 8,864.70 = 3,591.09 : x
2. Step 2: Convert to fraction form
   6,423.72/8,864.70 = 3,591.09/x
3. Step 3: Cross multiply
   6,423.72x = 8,864.70 × 3,591.09
4. Step 4: Simplify right side
   6,423.72x = 31,833,935.52
5. Step 5: Solve for x
   x = 31,833,935.52/6,423.72
6. Step 6: Final answer
   x = 4,955.69