Finding the Fourth Proportional to 1,439.48, 1,986.72 and 850.34

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.48 : 1,986.72 = 850.34 : x
2. Step 2: Convert to fraction form
   1,439.48/1,986.72 = 850.34/x
3. Step 3: Cross multiply
   1,439.48x = 1,986.72 × 850.34
4. Step 4: Simplify right side
   1,439.48x = 1,689,387.48
5. Step 5: Solve for x
   x = 1,689,387.48/1,439.48
6. Step 6: Final answer
   x = 1,173.61