Finding the Fourth Proportional to 2,338.56, 3,227.36 and 1,290.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,338.56 : 3,227.36 = 1,290.72 : x
2. Step 2: Convert to fraction form
   2,338.56/3,227.36 = 1,290.72/x
3. Step 3: Cross multiply
   2,338.56x = 3,227.36 × 1,290.72
4. Step 4: Simplify right side
   2,338.56x = 4,165,618.10
5. Step 5: Solve for x
   x = 4,165,618.10/2,338.56
6. Step 6: Final answer
   x = 1,781.27