Finding the Fourth Proportional to 3,664.74, 5,057.31 and 1,986.15

Step by Step Solution

1. Step 1: Write the proportion equation
   3,664.74 : 5,057.31 = 1,986.15 : x
2. Step 2: Convert to fraction form
   3,664.74/5,057.31 = 1,986.15/x
3. Step 3: Cross multiply
   3,664.74x = 5,057.31 × 1,986.15
4. Step 4: Simplify right side
   3,664.74x = 10,044,576.26
5. Step 5: Solve for x
   x = 10,044,576.26/3,664.74
6. Step 6: Final answer
   x = 2,740.87