Finding the Fourth Proportional to 1,439.46, 1,987.18 and 850.18

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.46 : 1,987.18 = 850.18 : x
2. Step 2: Convert to fraction form
   1,439.46/1,987.18 = 850.18/x
3. Step 3: Cross multiply
   1,439.46x = 1,987.18 × 850.18
4. Step 4: Simplify right side
   1,439.46x = 1,689,460.69
5. Step 5: Solve for x
   x = 1,689,460.69/1,439.46
6. Step 6: Final answer
   x = 1,173.68