Finding the Fourth Proportional to 1,168.93, 1,613.12 and 644.96

Step by Step Solution

1. Step 1: Write the proportion equation
   1,168.93 : 1,613.12 = 644.96 : x
2. Step 2: Convert to fraction form
   1,168.93/1,613.12 = 644.96/x
3. Step 3: Cross multiply
   1,168.93x = 1,613.12 × 644.96
4. Step 4: Simplify right side
   1,168.93x = 1,040,397.88
5. Step 5: Solve for x
   x = 1,040,397.88/1,168.93
6. Step 6: Final answer
   x = 890.04