Finding the Fourth Proportional to 2,644.53, 3,963.96 and 1,257

Step by Step Solution

1. Step 1: Write the proportion equation
   2,644.53 : 3,963.96 = 1,257 : x
2. Step 2: Convert to fraction form
   2,644.53/3,963.96 = 1,257/x
3. Step 3: Cross multiply
   2,644.53x = 3,963.96 × 1,257
4. Step 4: Simplify right side
   2,644.53x = 4,982,697.72
5. Step 5: Solve for x
   x = 4,982,697.72/2,644.53
6. Step 6: Final answer
   x = 1,884.15