Finding the Fourth Proportional to 2,338.18, 3,226.72 and 1,290.28

Step by Step Solution

1. Step 1: Write the proportion equation
   2,338.18 : 3,226.72 = 1,290.28 : x
2. Step 2: Convert to fraction form
   2,338.18/3,226.72 = 1,290.28/x
3. Step 3: Cross multiply
   2,338.18x = 3,226.72 × 1,290.28
4. Step 4: Simplify right side
   2,338.18x = 4,163,372.28
5. Step 5: Solve for x
   x = 4,163,372.28/2,338.18
6. Step 6: Final answer
   x = 1,780.60