Finding the Fourth Proportional to 1,780.12, 2,456.42 and 994.14

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.12 : 2,456.42 = 994.14 : x
2. Step 2: Convert to fraction form
   1,780.12/2,456.42 = 994.14/x
3. Step 3: Cross multiply
   1,780.12x = 2,456.42 × 994.14
4. Step 4: Simplify right side
   1,780.12x = 2,442,025.38
5. Step 5: Solve for x
   x = 2,442,025.38/1,780.12
6. Step 6: Final answer
   x = 1,371.83