Finding the Fourth Proportional to 1,436.58, 1,981.87 and 839.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,436.58 : 1,981.87 = 839.03 : x
2. Step 2: Convert to fraction form
   1,436.58/1,981.87 = 839.03/x
3. Step 3: Cross multiply
   1,436.58x = 1,981.87 × 839.03
4. Step 4: Simplify right side
   1,436.58x = 1,662,836.38
5. Step 5: Solve for x
   x = 1,662,836.38/1,436.58
6. Step 6: Final answer
   x = 1,157.50