Finding the Fourth Proportional to 2,057.45, 3,086.50 and 670.47

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.45 : 3,086.50 = 670.47 : x
2. Step 2: Convert to fraction form
   2,057.45/3,086.50 = 670.47/x
3. Step 3: Cross multiply
   2,057.45x = 3,086.50 × 670.47
4. Step 4: Simplify right side
   2,057.45x = 2,069,399.61
5. Step 5: Solve for x
   x = 2,069,399.61/2,057.45
6. Step 6: Final answer
   x = 1,005.81