Finding the Fourth Proportional to 1,439.27, 1,986.56 and 850.19

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.27 : 1,986.56 = 850.19 : x
2. Step 2: Convert to fraction form
   1,439.27/1,986.56 = 850.19/x
3. Step 3: Cross multiply
   1,439.27x = 1,986.56 × 850.19
4. Step 4: Simplify right side
   1,439.27x = 1,688,953.45
5. Step 5: Solve for x
   x = 1,688,953.45/1,439.27
6. Step 6: Final answer
   x = 1,173.48