Finding the Fourth Proportional to 1,780.06, 2,456.50 and 994.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.06 : 2,456.50 = 994.28 : x
2. Step 2: Convert to fraction form
   1,780.06/2,456.50 = 994.28/x
3. Step 3: Cross multiply
   1,780.06x = 2,456.50 × 994.28
4. Step 4: Simplify right side
   1,780.06x = 2,442,448.82
5. Step 5: Solve for x
   x = 2,442,448.82/1,780.06
6. Step 6: Final answer
   x = 1,372.12