Finding the Fourth Proportional to 2,057.61, 3,086.76 and 670.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,057.61 : 3,086.76 = 670.55 : x
2. Step 2: Convert to fraction form
   2,057.61/3,086.76 = 670.55/x
3. Step 3: Cross multiply
   2,057.61x = 3,086.76 × 670.55
4. Step 4: Simplify right side
   2,057.61x = 2,069,811.48
5. Step 5: Solve for x
   x = 2,069,811.48/2,057.61
6. Step 6: Final answer
   x = 1,005.93