Finding the Fourth Proportional to 1,436.59, 1,982.49 and 839.20

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.59 : 1,982.49 = 839.20 : x
2. Step 2: Convert to fraction form
   1,436.59/1,982.49 = 839.20/x
3. Step 3: Cross multiply
   1,436.59x = 1,982.49 × 839.20
4. Step 4: Simplify right side
   1,436.59x = 1,663,705.61
5. Step 5: Solve for x
   x = 1,663,705.61/1,436.59
6. Step 6: Final answer
   x = 1,158.09