Finding the Fourth Proportional to 1,780.07, 2,456.61 and 994.17

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.07 : 2,456.61 = 994.17 : x
2. Step 2: Convert to fraction form
   1,780.07/2,456.61 = 994.17/x
3. Step 3: Cross multiply
   1,780.07x = 2,456.61 × 994.17
4. Step 4: Simplify right side
   1,780.07x = 2,442,287.96
5. Step 5: Solve for x
   x = 2,442,287.96/1,780.07
6. Step 6: Final answer
   x = 1,372.02