Finding the Fourth Proportional to 2,686.30, 4,028.40 and 930.83

Step by Step Solution

1. Step 1: Write the proportion equation
   2,686.30 : 4,028.40 = 930.83 : x
2. Step 2: Convert to fraction form
   2,686.30/4,028.40 = 930.83/x
3. Step 3: Cross multiply
   2,686.30x = 4,028.40 × 930.83
4. Step 4: Simplify right side
   2,686.30x = 3,749,735.43
5. Step 5: Solve for x
   x = 3,749,735.43/2,686.30
6. Step 6: Final answer
   x = 1,395.87