Finding the Fourth Proportional to 2,491.50, 3,737.23 and 642.61

Step by Step Solution

1. Step 1: Write the proportion equation
   2,491.50 : 3,737.23 = 642.61 : x
2. Step 2: Convert to fraction form
   2,491.50/3,737.23 = 642.61/x
3. Step 3: Cross multiply
   2,491.50x = 3,737.23 × 642.61
4. Step 4: Simplify right side
   2,491.50x = 2,401,567.03
5. Step 5: Solve for x
   x = 2,401,567.03/2,491.50
6. Step 6: Final answer
   x = 963.90