Finding the Fourth Proportional to 1,016.50, 1,403.09 and 648.50

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.50 : 1,403.09 = 648.50 : x
2. Step 2: Convert to fraction form
   1,016.50/1,403.09 = 648.50/x
3. Step 3: Cross multiply
   1,016.50x = 1,403.09 × 648.50
4. Step 4: Simplify right side
   1,016.50x = 909,903.87
5. Step 5: Solve for x
   x = 909,903.87/1,016.50
6. Step 6: Final answer
   x = 895.13