Finding the Fourth Proportional to 2,057.81, 3,086.78 and 961.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.81 : 3,086.78 = 961.88 : x
2. Step 2: Convert to fraction form
   2,057.81/3,086.78 = 961.88/x
3. Step 3: Cross multiply
   2,057.81x = 3,086.78 × 961.88
4. Step 4: Simplify right side
   2,057.81x = 2,969,091.70
5. Step 5: Solve for x
   x = 2,969,091.70/2,057.81
6. Step 6: Final answer
   x = 1,442.84