Finding the Fourth Proportional to 1,439.76, 1,986.30 and 849.36

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.76 : 1,986.30 = 849.36 : x
2. Step 2: Convert to fraction form
   1,439.76/1,986.30 = 849.36/x
3. Step 3: Cross multiply
   1,439.76x = 1,986.30 × 849.36
4. Step 4: Simplify right side
   1,439.76x = 1,687,083.77
5. Step 5: Solve for x
   x = 1,687,083.77/1,439.76
6. Step 6: Final answer
   x = 1,171.78