Finding the Fourth Proportional to 1,780.46, 2,456.90 and 994.56

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.46 : 2,456.90 = 994.56 : x
2. Step 2: Convert to fraction form
   1,780.46/2,456.90 = 994.56/x
3. Step 3: Cross multiply
   1,780.46x = 2,456.90 × 994.56
4. Step 4: Simplify right side
   1,780.46x = 2,443,534.46
5. Step 5: Solve for x
   x = 2,443,534.46/1,780.46
6. Step 6: Final answer
   x = 1,372.42