Finding the Fourth Proportional to 1,439.58, 1,986.60 and 850.02

Step by Step Solution

1. Step 1: Write the proportion equation
   1,439.58 : 1,986.60 = 850.02 : x
2. Step 2: Convert to fraction form
   1,439.58/1,986.60 = 850.02/x
3. Step 3: Cross multiply
   1,439.58x = 1,986.60 × 850.02
4. Step 4: Simplify right side
   1,439.58x = 1,688,649.73
5. Step 5: Solve for x
   x = 1,688,649.73/1,439.58
6. Step 6: Final answer
   x = 1,173.02