Finding the Fourth Proportional to 2,761.50, 3,818.08 and 2,639.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,761.50 : 3,818.08 = 2,639.10 : x
2. Step 2: Convert to fraction form
   2,761.50/3,818.08 = 2,639.10/x
3. Step 3: Cross multiply
   2,761.50x = 3,818.08 × 2,639.10
4. Step 4: Simplify right side
   2,761.50x = 10,076,294.93
5. Step 5: Solve for x
   x = 10,076,294.93/2,761.50
6. Step 6: Final answer
   x = 3,648.85