Finding the Fourth Proportional to 1,168.96, 1,613.22 and 645.04

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.96 : 1,613.22 = 645.04 : x
2. Step 2: Convert to fraction form
   1,168.96/1,613.22 = 645.04/x
3. Step 3: Cross multiply
   1,168.96x = 1,613.22 × 645.04
4. Step 4: Simplify right side
   1,168.96x = 1,040,591.43
5. Step 5: Solve for x
   x = 1,040,591.43/1,168.96
6. Step 6: Final answer
   x = 890.19