Finding the Fourth Proportional to 2,338.79, 3,227.31 and 1,290.78

Step by Step Solution

1. Step 1: Write the proportion equation
   2,338.79 : 3,227.31 = 1,290.78 : x
2. Step 2: Convert to fraction form
   2,338.79/3,227.31 = 1,290.78/x
3. Step 3: Cross multiply
   2,338.79x = 3,227.31 × 1,290.78
4. Step 4: Simplify right side
   2,338.79x = 4,165,747.20
5. Step 5: Solve for x
   x = 4,165,747.20/2,338.79
6. Step 6: Final answer
   x = 1,781.16