Finding the Fourth Proportional to 2,493.43, 3,739.86 and 644.55

Step by Step Solution

1. Step 1: Write the proportion equation
   2,493.43 : 3,739.86 = 644.55 : x
2. Step 2: Convert to fraction form
   2,493.43/3,739.86 = 644.55/x
3. Step 3: Cross multiply
   2,493.43x = 3,739.86 × 644.55
4. Step 4: Simplify right side
   2,493.43x = 2,410,526.76
5. Step 5: Solve for x
   x = 2,410,526.76/2,493.43
6. Step 6: Final answer
   x = 966.75