Finding the Fourth Proportional to 1,116.03, 1,540.21 and 618.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.03 : 1,540.21 = 618.71 : x
2. Step 2: Convert to fraction form
   1,116.03/1,540.21 = 618.71/x
3. Step 3: Cross multiply
   1,116.03x = 1,540.21 × 618.71
4. Step 4: Simplify right side
   1,116.03x = 952,943.33
5. Step 5: Solve for x
   x = 952,943.33/1,116.03
6. Step 6: Final answer
   x = 853.87