Finding the Fourth Proportional to 1,440.18, 1,987.16 and 850.81

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.18 : 1,987.16 = 850.81 : x
2. Step 2: Convert to fraction form
   1,440.18/1,987.16 = 850.81/x
3. Step 3: Cross multiply
   1,440.18x = 1,987.16 × 850.81
4. Step 4: Simplify right side
   1,440.18x = 1,690,697.73
5. Step 5: Solve for x
   x = 1,690,697.73/1,440.18
6. Step 6: Final answer
   x = 1,173.95