Finding the Fourth Proportional to 2,751.38, 4,128.27 and 1,290.40

Step by Step Solution

1. Step 1: Write the proportion equation
   2,751.38 : 4,128.27 = 1,290.40 : x
2. Step 2: Convert to fraction form
   2,751.38/4,128.27 = 1,290.40/x
3. Step 3: Cross multiply
   2,751.38x = 4,128.27 × 1,290.40
4. Step 4: Simplify right side
   2,751.38x = 5,327,119.61
5. Step 5: Solve for x
   x = 5,327,119.61/2,751.38
6. Step 6: Final answer
   x = 1,936.16