Finding the Fourth Proportional to 2,072.39, 3,108.61 and 839.53

Step by Step Solution

1. Step 1: Write the proportion equation
   2,072.39 : 3,108.61 = 839.53 : x
2. Step 2: Convert to fraction form
   2,072.39/3,108.61 = 839.53/x
3. Step 3: Cross multiply
   2,072.39x = 3,108.61 × 839.53
4. Step 4: Simplify right side
   2,072.39x = 2,609,776.29
5. Step 5: Solve for x
   x = 2,609,776.29/2,072.39
6. Step 6: Final answer
   x = 1,259.31