Finding the Fourth Proportional to 2,638.38, 3,955.38 and 994.02

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.38 : 3,955.38 = 994.02 : x
2. Step 2: Convert to fraction form
   2,638.38/3,955.38 = 994.02/x
3. Step 3: Cross multiply
   2,638.38x = 3,955.38 × 994.02
4. Step 4: Simplify right side
   2,638.38x = 3,931,726.83
5. Step 5: Solve for x
   x = 3,931,726.83/2,638.38
6. Step 6: Final answer
   x = 1,490.20