Finding the Fourth Proportional to 1,439.28, 1,986.26 and 849.83

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.28 : 1,986.26 = 849.83 : x
2. Step 2: Convert to fraction form
   1,439.28/1,986.26 = 849.83/x
3. Step 3: Cross multiply
   1,439.28x = 1,986.26 × 849.83
4. Step 4: Simplify right side
   1,439.28x = 1,687,969.16
5. Step 5: Solve for x
   x = 1,687,969.16/1,439.28
6. Step 6: Final answer
   x = 1,172.79