Finding the Fourth Proportional to 2,338.68, 3,227.28 and 1,290.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,338.68 : 3,227.28 = 1,290.72 : x
2. Step 2: Convert to fraction form
   2,338.68/3,227.28 = 1,290.72/x
3. Step 3: Cross multiply
   2,338.68x = 3,227.28 × 1,290.72
4. Step 4: Simplify right side
   2,338.68x = 4,165,514.84
5. Step 5: Solve for x
   x = 4,165,514.84/2,338.68
6. Step 6: Final answer
   x = 1,781.14