Finding the Fourth Proportional to 1,648.28, 2,469.78 and 868.25

Step by Step Solution

1. Step 1: Write the proportion equation
   1,648.28 : 2,469.78 = 868.25 : x
2. Step 2: Convert to fraction form
   1,648.28/2,469.78 = 868.25/x
3. Step 3: Cross multiply
   1,648.28x = 2,469.78 × 868.25
4. Step 4: Simplify right side
   1,648.28x = 2,144,374.14
5. Step 5: Solve for x
   x = 2,144,374.14/1,648.28
6. Step 6: Final answer
   x = 1,300.98