Finding the Fourth Proportional to 2,638.12, 3,957.71 and 1,322.73

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.12 : 3,957.71 = 1,322.73 : x
2. Step 2: Convert to fraction form
   2,638.12/3,957.71 = 1,322.73/x
3. Step 3: Cross multiply
   2,638.12x = 3,957.71 × 1,322.73
4. Step 4: Simplify right side
   2,638.12x = 5,234,982.58
5. Step 5: Solve for x
   x = 5,234,982.58/2,638.12
6. Step 6: Final answer
   x = 1,984.36