Finding the Fourth Proportional to 1,780.23, 2,456.72 and 994.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.23 : 2,456.72 = 994.28 : x
2. Step 2: Convert to fraction form
   1,780.23/2,456.72 = 994.28/x
3. Step 3: Cross multiply
   1,780.23x = 2,456.72 × 994.28
4. Step 4: Simplify right side
   1,780.23x = 2,442,655.28
5. Step 5: Solve for x
   x = 2,442,655.28/1,780.23
6. Step 6: Final answer
   x = 1,372.10