Finding the Fourth Proportional to 8,401.72, 12,599.04 and 2,557

Step by Step Solution

1. Step 1: Write the proportion equation
   8,401.72 : 12,599.04 = 2,557 : x
2. Step 2: Convert to fraction form
   8,401.72/12,599.04 = 2,557/x
3. Step 3: Cross multiply
   8,401.72x = 12,599.04 × 2,557
4. Step 4: Simplify right side
   8,401.72x = 32,215,745.28
5. Step 5: Solve for x
   x = 32,215,745.28/8,401.72
6. Step 6: Final answer
   x = 3,834.42