Finding the Fourth Proportional to 3,665.21, 5,057.96 and 1,986.59

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.21 : 5,057.96 = 1,986.59 : x
2. Step 2: Convert to fraction form
   3,665.21/5,057.96 = 1,986.59/x
3. Step 3: Cross multiply
   3,665.21x = 5,057.96 × 1,986.59
4. Step 4: Simplify right side
   3,665.21x = 10,048,095.47
5. Step 5: Solve for x
   x = 10,048,095.47/3,665.21
6. Step 6: Final answer
   x = 2,741.48