Finding the Fourth Proportional to 1,780.25, 2,456.78 and 994.23

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.25 : 2,456.78 = 994.23 : x
2. Step 2: Convert to fraction form
   1,780.25/2,456.78 = 994.23/x
3. Step 3: Cross multiply
   1,780.25x = 2,456.78 × 994.23
4. Step 4: Simplify right side
   1,780.25x = 2,442,599.41
5. Step 5: Solve for x
   x = 2,442,599.41/1,780.25
6. Step 6: Final answer
   x = 1,372.06