Finding the Fourth Proportional to 2,058.21, 3,078.81 and 1,688.85

Step by Step Solution

1. Step 1: Write the proportion equation
   2,058.21 : 3,078.81 = 1,688.85 : x
2. Step 2: Convert to fraction form
   2,058.21/3,078.81 = 1,688.85/x
3. Step 3: Cross multiply
   2,058.21x = 3,078.81 × 1,688.85
4. Step 4: Simplify right side
   2,058.21x = 5,199,648.27
5. Step 5: Solve for x
   x = 5,199,648.27/2,058.21
6. Step 6: Final answer
   x = 2,526.30