Finding the Fourth Proportional to 3,665.66, 5,058.59 and 1,987.10

Step by Step Solution

1. Step 1: Write the proportion equation
   3,665.66 : 5,058.59 = 1,987.10 : x
2. Step 2: Convert to fraction form
   3,665.66/5,058.59 = 1,987.10/x
3. Step 3: Cross multiply
   3,665.66x = 5,058.59 × 1,987.10
4. Step 4: Simplify right side
   3,665.66x = 10,051,907.93
5. Step 5: Solve for x
   x = 10,051,907.93/3,665.66
6. Step 6: Final answer
   x = 2,742.19