Finding the Fourth Proportional to 2,638.80, 3,641.58 and 1,644.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.80 : 3,641.58 = 1,644.48 : x
2. Step 2: Convert to fraction form
   2,638.80/3,641.58 = 1,644.48/x
3. Step 3: Cross multiply
   2,638.80x = 3,641.58 × 1,644.48
4. Step 4: Simplify right side
   2,638.80x = 5,988,505.48
5. Step 5: Solve for x
   x = 5,988,505.48/2,638.80
6. Step 6: Final answer
   x = 2,269.40