Finding the Fourth Proportional to 1,440.42, 1,986.84 and 850.47

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.42 : 1,986.84 = 850.47 : x
2. Step 2: Convert to fraction form
   1,440.42/1,986.84 = 850.47/x
3. Step 3: Cross multiply
   1,440.42x = 1,986.84 × 850.47
4. Step 4: Simplify right side
   1,440.42x = 1,689,747.81
5. Step 5: Solve for x
   x = 1,689,747.81/1,440.42
6. Step 6: Final answer
   x = 1,173.09