Finding the Fourth Proportional to 1,638.96, 2,260.72 and 1,049.28

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.96 : 2,260.72 = 1,049.28 : x
2. Step 2: Convert to fraction form
   1,638.96/2,260.72 = 1,049.28/x
3. Step 3: Cross multiply
   1,638.96x = 2,260.72 × 1,049.28
4. Step 4: Simplify right side
   1,638.96x = 2,372,128.28
5. Step 5: Solve for x
   x = 2,372,128.28/1,638.96
6. Step 6: Final answer
   x = 1,447.34