Finding the Fourth Proportional to 2,638.89, 3,641.09 and 1,976.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.89 : 3,641.09 = 1,976.31 : x
2. Step 2: Convert to fraction form
   2,638.89/3,641.09 = 1,976.31/x
3. Step 3: Cross multiply
   2,638.89x = 3,641.09 × 1,976.31
4. Step 4: Simplify right side
   2,638.89x = 7,195,912.70
5. Step 5: Solve for x
   x = 7,195,912.70/2,638.89
6. Step 6: Final answer
   x = 2,726.87