Finding the Fourth Proportional to 1,040.40, 1,436.67 and 648.09

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.40 : 1,436.67 = 648.09 : x
2. Step 2: Convert to fraction form
   1,040.40/1,436.67 = 648.09/x
3. Step 3: Cross multiply
   1,040.40x = 1,436.67 × 648.09
4. Step 4: Simplify right side
   1,040.40x = 931,091.46
5. Step 5: Solve for x
   x = 931,091.46/1,040.40
6. Step 6: Final answer
   x = 894.94