Finding the Fourth Proportional to 2,644.25, 3,964.70 and 1,326.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,644.25 : 3,964.70 = 1,326.43 : x
2. Step 2: Convert to fraction form
   2,644.25/3,964.70 = 1,326.43/x
3. Step 3: Cross multiply
   2,644.25x = 3,964.70 × 1,326.43
4. Step 4: Simplify right side
   2,644.25x = 5,258,875.53
5. Step 5: Solve for x
   x = 5,258,875.53/2,644.25
6. Step 6: Final answer
   x = 1,988.80