Finding the Fourth Proportional to 1,436.89, 1,983.18 and 839.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.89 : 1,983.18 = 839.45 : x
2. Step 2: Convert to fraction form
   1,436.89/1,983.18 = 839.45/x
3. Step 3: Cross multiply
   1,436.89x = 1,983.18 × 839.45
4. Step 4: Simplify right side
   1,436.89x = 1,664,785.77
5. Step 5: Solve for x
   x = 1,664,785.77/1,436.89
6. Step 6: Final answer
   x = 1,158.60