Finding the Fourth Proportional to 2,057.72, 3,086.10 and 670.70

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.72 : 3,086.10 = 670.70 : x
2. Step 2: Convert to fraction form
   2,057.72/3,086.10 = 670.70/x
3. Step 3: Cross multiply
   2,057.72x = 3,086.10 × 670.70
4. Step 4: Simplify right side
   2,057.72x = 2,069,847.27
5. Step 5: Solve for x
   x = 2,069,847.27/2,057.72
6. Step 6: Final answer
   x = 1,005.89