Finding the Fourth Proportional to 2,688.14, 4,032.50 and 839.31

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.14 : 4,032.50 = 839.31 : x
2. Step 2: Convert to fraction form
   2,688.14/4,032.50 = 839.31/x
3. Step 3: Cross multiply
   2,688.14x = 4,032.50 × 839.31
4. Step 4: Simplify right side
   2,688.14x = 3,384,513.38
5. Step 5: Solve for x
   x = 3,384,513.38/2,688.14
6. Step 6: Final answer
   x = 1,259.06