Finding the Fourth Proportional to 2,338.21, 3,226.71 and 1,290.25

Step by Step Solution

1. Step 1: Write the proportion equation
   2,338.21 : 3,226.71 = 1,290.25 : x
2. Step 2: Convert to fraction form
   2,338.21/3,226.71 = 1,290.25/x
3. Step 3: Cross multiply
   2,338.21x = 3,226.71 × 1,290.25
4. Step 4: Simplify right side
   2,338.21x = 4,163,262.58
5. Step 5: Solve for x
   x = 4,163,262.58/2,338.21
6. Step 6: Final answer
   x = 1,780.53