Finding the Fourth Proportional to 2,338.78, 3,227.36 and 1,290.86

Step by Step Solution

1. Step 1: Write the proportion equation
   2,338.78 : 3,227.36 = 1,290.86 : x
2. Step 2: Convert to fraction form
   2,338.78/3,227.36 = 1,290.86/x
3. Step 3: Cross multiply
   2,338.78x = 3,227.36 × 1,290.86
4. Step 4: Simplify right side
   2,338.78x = 4,166,069.93
5. Step 5: Solve for x
   x = 4,166,069.93/2,338.78
6. Step 6: Final answer
   x = 1,781.30