Finding the Fourth Proportional to 1,780.17, 2,456.57 and 994.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.17 : 2,456.57 = 994.22 : x
2. Step 2: Convert to fraction form
   1,780.17/2,456.57 = 994.22/x
3. Step 3: Cross multiply
   1,780.17x = 2,456.57 × 994.22
4. Step 4: Simplify right side
   1,780.17x = 2,442,353.77
5. Step 5: Solve for x
   x = 2,442,353.77/1,780.17
6. Step 6: Final answer
   x = 1,371.98