Finding the Fourth Proportional to 2,688.94, 4,031.84 and 839.52

Step by Step Solution

1. Step 1: Write the proportion equation
   2,688.94 : 4,031.84 = 839.52 : x
2. Step 2: Convert to fraction form
   2,688.94/4,031.84 = 839.52/x
3. Step 3: Cross multiply
   2,688.94x = 4,031.84 × 839.52
4. Step 4: Simplify right side
   2,688.94x = 3,384,810.32
5. Step 5: Solve for x
   x = 3,384,810.32/2,688.94
6. Step 6: Final answer
   x = 1,258.79