Finding the Fourth Proportional to 1,116.02, 1,540.13 and 618.71

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.02 : 1,540.13 = 618.71 : x
2. Step 2: Convert to fraction form
   1,116.02/1,540.13 = 618.71/x
3. Step 3: Cross multiply
   1,116.02x = 1,540.13 × 618.71
4. Step 4: Simplify right side
   1,116.02x = 952,883.04
5. Step 5: Solve for x
   x = 952,883.04/1,116.02
6. Step 6: Final answer
   x = 853.82