Finding the Fourth Proportional to 1,168.98, 1,613.22 and 645.06

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.98 : 1,613.22 = 645.06 : x
2. Step 2: Convert to fraction form
   1,168.98/1,613.22 = 645.06/x
3. Step 3: Cross multiply
   1,168.98x = 1,613.22 × 645.06
4. Step 4: Simplify right side
   1,168.98x = 1,040,623.69
5. Step 5: Solve for x
   x = 1,040,623.69/1,168.98
6. Step 6: Final answer
   x = 890.20