Finding the Fourth Proportional to 3,665.18, 5,057.93 and 1,986.58

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.18 : 5,057.93 = 1,986.58 : x
2. Step 2: Convert to fraction form
   3,665.18/5,057.93 = 1,986.58/x
3. Step 3: Cross multiply
   3,665.18x = 5,057.93 × 1,986.58
4. Step 4: Simplify right side
   3,665.18x = 10,047,982.58
5. Step 5: Solve for x
   x = 10,047,982.58/3,665.18
6. Step 6: Final answer
   x = 2,741.47