Finding the Fourth Proportional to 1,011.38, 1,395.72 and 618.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.38 : 1,395.72 = 618.62 : x
2. Step 2: Convert to fraction form
   1,011.38/1,395.72 = 618.62/x
3. Step 3: Cross multiply
   1,011.38x = 1,395.72 × 618.62
4. Step 4: Simplify right side
   1,011.38x = 863,413.33
5. Step 5: Solve for x
   x = 863,413.33/1,011.38
6. Step 6: Final answer
   x = 853.70