Finding the Fourth Proportional to 2,105.32, 3,157.94 and 644.43

Step by Step Solution

1. Step 1: Write the proportion equation
   2,105.32 : 3,157.94 = 644.43 : x
2. Step 2: Convert to fraction form
   2,105.32/3,157.94 = 644.43/x
3. Step 3: Cross multiply
   2,105.32x = 3,157.94 × 644.43
4. Step 4: Simplify right side
   2,105.32x = 2,035,072.22
5. Step 5: Solve for x
   x = 2,035,072.22/2,105.32
6. Step 6: Final answer
   x = 966.63