Finding the Fourth Proportional to 1,040.42, 1,436.40 and 647.98

Step by Step Solution

1. Step 1: Write the proportion equation
   1,040.42 : 1,436.40 = 647.98 : x
2. Step 2: Convert to fraction form
   1,040.42/1,436.40 = 647.98/x
3. Step 3: Cross multiply
   1,040.42x = 1,436.40 × 647.98
4. Step 4: Simplify right side
   1,040.42x = 930,758.47
5. Step 5: Solve for x
   x = 930,758.47/1,040.42
6. Step 6: Final answer
   x = 894.60