Finding the Fourth Proportional to 2,105.22, 3,157.82 and 644.32

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.22 : 3,157.82 = 644.32 : x
2. Step 2: Convert to fraction form
   2,105.22/3,157.82 = 644.32/x
3. Step 3: Cross multiply
   2,105.22x = 3,157.82 × 644.32
4. Step 4: Simplify right side
   2,105.22x = 2,034,646.58
5. Step 5: Solve for x
   x = 2,034,646.58/2,105.22
6. Step 6: Final answer
   x = 966.48