Finding the Fourth Proportional to 1,129.34, 1,559.31 and 850.22

Step by Step Solution

1. Step 1: Write the proportion equation
   1,129.34 : 1,559.31 = 850.22 : x
2. Step 2: Convert to fraction form
   1,129.34/1,559.31 = 850.22/x
3. Step 3: Cross multiply
   1,129.34x = 1,559.31 × 850.22
4. Step 4: Simplify right side
   1,129.34x = 1,325,756.55
5. Step 5: Solve for x
   x = 1,325,756.55/1,129.34
6. Step 6: Final answer
   x = 1,173.92