Finding the Fourth Proportional to 2,663.78, 3,995.30 and 908.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,663.78 : 3,995.30 = 908.78 : x
2. Step 2: Convert to fraction form
   2,663.78/3,995.30 = 908.78/x
3. Step 3: Cross multiply
   2,663.78x = 3,995.30 × 908.78
4. Step 4: Simplify right side
   2,663.78x = 3,630,848.73
5. Step 5: Solve for x
   x = 3,630,848.73/2,663.78
6. Step 6: Final answer
   x = 1,363.04