Finding the Fourth Proportional to 1,322.98, 1,983.78 and 664.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,322.98 : 1,983.78 = 664.18 : x
2. Step 2: Convert to fraction form
   1,322.98/1,983.78 = 664.18/x
3. Step 3: Cross multiply
   1,322.98x = 1,983.78 × 664.18
4. Step 4: Simplify right side
   1,322.98x = 1,317,587.00
5. Step 5: Solve for x
   x = 1,317,587.00/1,322.98
6. Step 6: Final answer
   x = 995.92