Finding the Fourth Proportional to 1,439.52, 1,986.18 and 850.08

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.52 : 1,986.18 = 850.08 : x
2. Step 2: Convert to fraction form
   1,439.52/1,986.18 = 850.08/x
3. Step 3: Cross multiply
   1,439.52x = 1,986.18 × 850.08
4. Step 4: Simplify right side
   1,439.52x = 1,688,411.89
5. Step 5: Solve for x
   x = 1,688,411.89/1,439.52
6. Step 6: Final answer
   x = 1,172.90