Finding the Fourth Proportional to 1,637.82, 2,456.69 and 663.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,637.82 : 2,456.69 = 663.89 : x
2. Step 2: Convert to fraction form
   1,637.82/2,456.69 = 663.89/x
3. Step 3: Cross multiply
   1,637.82x = 2,456.69 × 663.89
4. Step 4: Simplify right side
   1,637.82x = 1,630,956.32
5. Step 5: Solve for x
   x = 1,630,956.32/1,637.82
6. Step 6: Final answer
   x = 995.81