Finding the Fourth Proportional to 2,676.38, 4,012.88 and 1,290.06

Step by Step Solution

1. Step 1: Write the proportion equation
   2,676.38 : 4,012.88 = 1,290.06 : x
2. Step 2: Convert to fraction form
   2,676.38/4,012.88 = 1,290.06/x
3. Step 3: Cross multiply
   2,676.38x = 4,012.88 × 1,290.06
4. Step 4: Simplify right side
   2,676.38x = 5,176,849.52
5. Step 5: Solve for x
   x = 5,176,849.52/2,676.38
6. Step 6: Final answer
   x = 1,934.28