Finding the Fourth Proportional to 3,665.36, 5,058.20 and 1,986.78

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.36 : 5,058.20 = 1,986.78 : x
2. Step 2: Convert to fraction form
   3,665.36/5,058.20 = 1,986.78/x
3. Step 3: Cross multiply
   3,665.36x = 5,058.20 × 1,986.78
4. Step 4: Simplify right side
   3,665.36x = 10,049,530.60
5. Step 5: Solve for x
   x = 10,049,530.60/3,665.36
6. Step 6: Final answer
   x = 2,741.76