Finding the Fourth Proportional to 2,639.88, 3,642.12 and 1,644.48

Step by Step Solution

1. Step 1: Write the proportion equation
   2,639.88 : 3,642.12 = 1,644.48 : x
2. Step 2: Convert to fraction form
   2,639.88/3,642.12 = 1,644.48/x
3. Step 3: Cross multiply
   2,639.88x = 3,642.12 × 1,644.48
4. Step 4: Simplify right side
   2,639.88x = 5,989,393.50
5. Step 5: Solve for x
   x = 5,989,393.50/2,639.88
6. Step 6: Final answer
   x = 2,268.81