Finding the Fourth Proportional to 3,665.09, 5,057.73 and 1,986.42

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.09 : 5,057.73 = 1,986.42 : x
2. Step 2: Convert to fraction form
   3,665.09/5,057.73 = 1,986.42/x
3. Step 3: Cross multiply
   3,665.09x = 5,057.73 × 1,986.42
4. Step 4: Simplify right side
   3,665.09x = 10,046,776.03
5. Step 5: Solve for x
   x = 10,046,776.03/3,665.09
6. Step 6: Final answer
   x = 2,741.21