Finding the Fourth Proportional to 2,058.90, 3,086.55 and 1,840.20

Step by Step Solution

1. Step 1: Write the proportion equation
   2,058.90 : 3,086.55 = 1,840.20 : x
2. Step 2: Convert to fraction form
   2,058.90/3,086.55 = 1,840.20/x
3. Step 3: Cross multiply
   2,058.90x = 3,086.55 × 1,840.20
4. Step 4: Simplify right side
   2,058.90x = 5,679,869.31
5. Step 5: Solve for x
   x = 5,679,869.31/2,058.90
6. Step 6: Final answer
   x = 2,758.69