Finding the Fourth Proportional to 5,401.50, 8,103.69 and 2,665.50

Step by Step Solution

1. Step 1: Write the proportion equation
   5,401.50 : 8,103.69 = 2,665.50 : x
2. Step 2: Convert to fraction form
   5,401.50/8,103.69 = 2,665.50/x
3. Step 3: Cross multiply
   5,401.50x = 8,103.69 × 2,665.50
4. Step 4: Simplify right side
   5,401.50x = 21,600,385.70
5. Step 5: Solve for x
   x = 21,600,385.70/5,401.50
6. Step 6: Final answer
   x = 3,998.96