Finding the Fourth Proportional to 2,057.69, 3,084.99 and 670.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.69 : 3,084.99 = 670.20 : x
2. Step 2: Convert to fraction form
   2,057.69/3,084.99 = 670.20/x
3. Step 3: Cross multiply
   2,057.69x = 3,084.99 × 670.20
4. Step 4: Simplify right side
   2,057.69x = 2,067,560.30
5. Step 5: Solve for x
   x = 2,067,560.30/2,057.69
6. Step 6: Final answer
   x = 1,004.80