Finding the Fourth Proportional to 2,104.94, 3,157.20 and 644.10

Step by Step Solution

1. Step 1: Write the proportion equation
   2,104.94 : 3,157.20 = 644.10 : x
2. Step 2: Convert to fraction form
   2,104.94/3,157.20 = 644.10/x
3. Step 3: Cross multiply
   2,104.94x = 3,157.20 × 644.10
4. Step 4: Simplify right side
   2,104.94x = 2,033,552.52
5. Step 5: Solve for x
   x = 2,033,552.52/2,104.94
6. Step 6: Final answer
   x = 966.09