Finding the Fourth Proportional to 1,780.25, 2,456.74 and 994.29

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.25 : 2,456.74 = 994.29 : x
2. Step 2: Convert to fraction form
   1,780.25/2,456.74 = 994.29/x
3. Step 3: Cross multiply
   1,780.25x = 2,456.74 × 994.29
4. Step 4: Simplify right side
   1,780.25x = 2,442,712.27
5. Step 5: Solve for x
   x = 2,442,712.27/1,780.25
6. Step 6: Final answer
   x = 1,372.12