Finding the Fourth Proportional to 1,403.98, 2,105.52 and 663.49

Step by Step Solution

1. Step 1: Write the proportion equation
   1,403.98 : 2,105.52 = 663.49 : x
2. Step 2: Convert to fraction form
   1,403.98/2,105.52 = 663.49/x
3. Step 3: Cross multiply
   1,403.98x = 2,105.52 × 663.49
4. Step 4: Simplify right side
   1,403.98x = 1,396,993.47
5. Step 5: Solve for x
   x = 1,396,993.47/1,403.98
6. Step 6: Final answer
   x = 995.02