Finding the Fourth Proportional to 1,780.18, 2,456.53 and 994.07

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.18 : 2,456.53 = 994.07 : x
2. Step 2: Convert to fraction form
   1,780.18/2,456.53 = 994.07/x
3. Step 3: Cross multiply
   1,780.18x = 2,456.53 × 994.07
4. Step 4: Simplify right side
   1,780.18x = 2,441,966.43
5. Step 5: Solve for x
   x = 2,441,966.43/1,780.18
6. Step 6: Final answer
   x = 1,371.75