Finding the Fourth Proportional to 1,436.49, 1,982.42 and 839.38

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.49 : 1,982.42 = 839.38 : x
2. Step 2: Convert to fraction form
   1,436.49/1,982.42 = 839.38/x
3. Step 3: Cross multiply
   1,436.49x = 1,982.42 × 839.38
4. Step 4: Simplify right side
   1,436.49x = 1,663,997.77
5. Step 5: Solve for x
   x = 1,663,997.77/1,436.49
6. Step 6: Final answer
   x = 1,158.38