Finding the Fourth Proportional to 2,081.80, 3,123.78 and 1,351.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,081.80 : 3,123.78 = 1,351.72 : x
2. Step 2: Convert to fraction form
   2,081.80/3,123.78 = 1,351.72/x
3. Step 3: Cross multiply
   2,081.80x = 3,123.78 × 1,351.72
4. Step 4: Simplify right side
   2,081.80x = 4,222,475.90
5. Step 5: Solve for x
   x = 4,222,475.90/2,081.80
6. Step 6: Final answer
   x = 2,028.28