Finding the Fourth Proportional to 1,116.25, 1,540.43 and 618.89

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.25 : 1,540.43 = 618.89 : x
2. Step 2: Convert to fraction form
   1,116.25/1,540.43 = 618.89/x
3. Step 3: Cross multiply
   1,116.25x = 1,540.43 × 618.89
4. Step 4: Simplify right side
   1,116.25x = 953,357.48
5. Step 5: Solve for x
   x = 953,357.48/1,116.25
6. Step 6: Final answer
   x = 854.07