Finding the Fourth Proportional to 3,665.90, 5,058.96 and 1,987.34

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.90 : 5,058.96 = 1,987.34 : x
2. Step 2: Convert to fraction form
   3,665.90/5,058.96 = 1,987.34/x
3. Step 3: Cross multiply
   3,665.90x = 5,058.96 × 1,987.34
4. Step 4: Simplify right side
   3,665.90x = 10,053,873.57
5. Step 5: Solve for x
   x = 10,053,873.57/3,665.90
6. Step 6: Final answer
   x = 2,742.54