Finding the Fourth Proportional to 2,057.20, 3,084.89 and 961.88

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.20 : 3,084.89 = 961.88 : x
2. Step 2: Convert to fraction form
   2,057.20/3,084.89 = 961.88/x
3. Step 3: Cross multiply
   2,057.20x = 3,084.89 × 961.88
4. Step 4: Simplify right side
   2,057.20x = 2,967,273.76
5. Step 5: Solve for x
   x = 2,967,273.76/2,057.20
6. Step 6: Final answer
   x = 1,442.39