Finding the Fourth Proportional to 1,780.27, 2,456.87 and 994.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.27 : 2,456.87 = 994.30 : x
2. Step 2: Convert to fraction form
   1,780.27/2,456.87 = 994.30/x
3. Step 3: Cross multiply
   1,780.27x = 2,456.87 × 994.30
4. Step 4: Simplify right side
   1,780.27x = 2,442,854.73
5. Step 5: Solve for x
   x = 2,442,854.73/1,780.27
6. Step 6: Final answer
   x = 1,372.18