Finding the Fourth Proportional to 1,780.21, 2,456.82 and 994.24

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.21 : 2,456.82 = 994.24 : x
2. Step 2: Convert to fraction form
   1,780.21/2,456.82 = 994.24/x
3. Step 3: Cross multiply
   1,780.21x = 2,456.82 × 994.24
4. Step 4: Simplify right side
   1,780.21x = 2,442,668.72
5. Step 5: Solve for x
   x = 2,442,668.72/1,780.21
6. Step 6: Final answer
   x = 1,372.12