Finding the Fourth Proportional to 1,638.94, 2,258.59 and 1,048.45

Step by Step Solution

1. Step 1: Write the proportion equation
   1,638.94 : 2,258.59 = 1,048.45 : x
2. Step 2: Convert to fraction form
   1,638.94/2,258.59 = 1,048.45/x
3. Step 3: Cross multiply
   1,638.94x = 2,258.59 × 1,048.45
4. Step 4: Simplify right side
   1,638.94x = 2,368,018.69
5. Step 5: Solve for x
   x = 2,368,018.69/1,638.94
6. Step 6: Final answer
   x = 1,444.85