Finding the Fourth Proportional to 1,439.57, 1,986.66 and 850.10

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.57 : 1,986.66 = 850.10 : x
2. Step 2: Convert to fraction form
   1,439.57/1,986.66 = 850.10/x
3. Step 3: Cross multiply
   1,439.57x = 1,986.66 × 850.10
4. Step 4: Simplify right side
   1,439.57x = 1,688,859.67
5. Step 5: Solve for x
   x = 1,688,859.67/1,439.57
6. Step 6: Final answer
   x = 1,173.17