Finding the Fourth Proportional to 2,105.33, 3,158.19 and 644.09

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.33 : 3,158.19 = 644.09 : x
2. Step 2: Convert to fraction form
   2,105.33/3,158.19 = 644.09/x
3. Step 3: Cross multiply
   2,105.33x = 3,158.19 × 644.09
4. Step 4: Simplify right side
   2,105.33x = 2,034,142.81
5. Step 5: Solve for x
   x = 2,034,142.81/2,105.33
6. Step 6: Final answer
   x = 966.19