Finding the Fourth Proportional to 2,137.89, 3,204.99 and 839.05

Step by Step Solution

1. Step 1: Write the proportion equation
   2,137.89 : 3,204.99 = 839.05 : x
2. Step 2: Convert to fraction form
   2,137.89/3,204.99 = 839.05/x
3. Step 3: Cross multiply
   2,137.89x = 3,204.99 × 839.05
4. Step 4: Simplify right side
   2,137.89x = 2,689,146.86
5. Step 5: Solve for x
   x = 2,689,146.86/2,137.89
6. Step 6: Final answer
   x = 1,257.85