Finding the Fourth Proportional to 1,440.59, 1,987.31 and 850.77

Step by Step Solution

1. Step 1: Write the proportion equation
   1,440.59 : 1,987.31 = 850.77 : x
2. Step 2: Convert to fraction form
   1,440.59/1,987.31 = 850.77/x
3. Step 3: Cross multiply
   1,440.59x = 1,987.31 × 850.77
4. Step 4: Simplify right side
   1,440.59x = 1,690,739.47
5. Step 5: Solve for x
   x = 1,690,739.47/1,440.59
6. Step 6: Final answer
   x = 1,173.65