Finding the Fourth Proportional to 2,751.98, 4,128.21 and 1,290.35

Step by Step Solution

1. Step 1: Write the proportion equation
   2,751.98 : 4,128.21 = 1,290.35 : x
2. Step 2: Convert to fraction form
   2,751.98/4,128.21 = 1,290.35/x
3. Step 3: Cross multiply
   2,751.98x = 4,128.21 × 1,290.35
4. Step 4: Simplify right side
   2,751.98x = 5,326,835.77
5. Step 5: Solve for x
   x = 5,326,835.77/2,751.98
6. Step 6: Final answer
   x = 1,935.64