Finding the Fourth Proportional to 6,423.98, 8,864.55 and 3,591.20

Step by Step Solution

1. Step 1: Write the proportion equation
   6,423.98 : 8,864.55 = 3,591.20 : x
2. Step 2: Convert to fraction form
   6,423.98/8,864.55 = 3,591.20/x
3. Step 3: Cross multiply
   6,423.98x = 8,864.55 × 3,591.20
4. Step 4: Simplify right side
   6,423.98x = 31,834,394.12
5. Step 5: Solve for x
   x = 31,834,394.12/6,423.98
6. Step 6: Final answer
   x = 4,955.56