Finding the Fourth Proportional to 2,638.40, 3,955.30 and 994.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,638.40 : 3,955.30 = 994.52 : x
2. Step 2: Convert to fraction form
   2,638.40/3,955.30 = 994.52/x
3. Step 3: Cross multiply
   2,638.40x = 3,955.30 × 994.52
4. Step 4: Simplify right side
   2,638.40x = 3,933,624.96
5. Step 5: Solve for x
   x = 3,933,624.96/2,638.40
6. Step 6: Final answer
   x = 1,490.91