Finding the Fourth Proportional to 2,638.52, 3,956.78 and 994.18

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.52 : 3,956.78 = 994.18 : x
2. Step 2: Convert to fraction form
   2,638.52/3,956.78 = 994.18/x
3. Step 3: Cross multiply
   2,638.52x = 3,956.78 × 994.18
4. Step 4: Simplify right side
   2,638.52x = 3,933,751.54
5. Step 5: Solve for x
   x = 3,933,751.54/2,638.52
6. Step 6: Final answer
   x = 1,490.89