Finding the Fourth Proportional to 3,665.81, 5,058.79 and 1,987.18

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.81 : 5,058.79 = 1,987.18 : x
2. Step 2: Convert to fraction form
   3,665.81/5,058.79 = 1,987.18/x
3. Step 3: Cross multiply
   3,665.81x = 5,058.79 × 1,987.18
4. Step 4: Simplify right side
   3,665.81x = 10,052,708.70
5. Step 5: Solve for x
   x = 10,052,708.70/3,665.81
6. Step 6: Final answer
   x = 2,742.29