Finding the Fourth Proportional to 1,780.12, 2,456.52 and 994.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.12 : 2,456.52 = 994.15 : x
2. Step 2: Convert to fraction form
   1,780.12/2,456.52 = 994.15/x
3. Step 3: Cross multiply
   1,780.12x = 2,456.52 × 994.15
4. Step 4: Simplify right side
   1,780.12x = 2,442,149.36
5. Step 5: Solve for x
   x = 2,442,149.36/1,780.12
6. Step 6: Final answer
   x = 1,371.90