Finding the Fourth Proportional to 1,116.22, 1,540.29 and 618.82

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.22 : 1,540.29 = 618.82 : x
2. Step 2: Convert to fraction form
   1,116.22/1,540.29 = 618.82/x
3. Step 3: Cross multiply
   1,116.22x = 1,540.29 × 618.82
4. Step 4: Simplify right side
   1,116.22x = 953,162.26
5. Step 5: Solve for x
   x = 953,162.26/1,116.22
6. Step 6: Final answer
   x = 853.92