Finding the Fourth Proportional to 1,439.33, 1,986.30 and 849.90

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.33 : 1,986.30 = 849.90 : x
2. Step 2: Convert to fraction form
   1,439.33/1,986.30 = 849.90/x
3. Step 3: Cross multiply
   1,439.33x = 1,986.30 × 849.90
4. Step 4: Simplify right side
   1,439.33x = 1,688,156.37
5. Step 5: Solve for x
   x = 1,688,156.37/1,439.33
6. Step 6: Final answer
   x = 1,172.88