Finding the Fourth Proportional to 1,780.34, 2,456.90 and 994.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.34 : 2,456.90 = 994.38 : x
2. Step 2: Convert to fraction form
   1,780.34/2,456.90 = 994.38/x
3. Step 3: Cross multiply
   1,780.34x = 2,456.90 × 994.38
4. Step 4: Simplify right side
   1,780.34x = 2,443,087.25
5. Step 5: Solve for x
   x = 2,443,087.25/1,780.34
6. Step 6: Final answer
   x = 1,372.26