Finding the Fourth Proportional to 1,780.16, 2,456.64 and 994.26

Step by Step Solution

1. Step 1: Write the proportion equation
   1,780.16 : 2,456.64 = 994.26 : x
2. Step 2: Convert to fraction form
   1,780.16/2,456.64 = 994.26/x
3. Step 3: Cross multiply
   1,780.16x = 2,456.64 × 994.26
4. Step 4: Simplify right side
   1,780.16x = 2,442,538.89
5. Step 5: Solve for x
   x = 2,442,538.89/1,780.16
6. Step 6: Final answer
   x = 1,372.09