Finding the Fourth Proportional to 1,436.85, 1,982.70 and 839.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.85 : 1,982.70 = 839.34 : x
2. Step 2: Convert to fraction form
   1,436.85/1,982.70 = 839.34/x
3. Step 3: Cross multiply
   1,436.85x = 1,982.70 × 839.34
4. Step 4: Simplify right side
   1,436.85x = 1,664,159.42
5. Step 5: Solve for x
   x = 1,664,159.42/1,436.85
6. Step 6: Final answer
   x = 1,158.20