Finding the Fourth Proportional to 2,590.78, 3,882.39 and 1,290.46

Step by Step Solution

1. Step 1: Write the proportion equation
   2,590.78 : 3,882.39 = 1,290.46 : x
2. Step 2: Convert to fraction form
   2,590.78/3,882.39 = 1,290.46/x
3. Step 3: Cross multiply
   2,590.78x = 3,882.39 × 1,290.46
4. Step 4: Simplify right side
   2,590.78x = 5,010,069.00
5. Step 5: Solve for x
   x = 5,010,069.00/2,590.78
6. Step 6: Final answer
   x = 1,933.81