Finding the Fourth Proportional to 2,104.37, 3,156.69 and 644.54

Step by Step Solution

1. Step 1: Write the proportion equation
   2,104.37 : 3,156.69 = 644.54 : x
2. Step 2: Convert to fraction form
   2,104.37/3,156.69 = 644.54/x
3. Step 3: Cross multiply
   2,104.37x = 3,156.69 × 644.54
4. Step 4: Simplify right side
   2,104.37x = 2,034,597.19
5. Step 5: Solve for x
   x = 2,034,597.19/2,104.37
6. Step 6: Final answer
   x = 966.85