Finding the Fourth Proportional to 1,116.01, 1,540.06 and 618.63

Step by Step Solution

1. Step 1: Write the proportion equation
   1,116.01 : 1,540.06 = 618.63 : x
2. Step 2: Convert to fraction form
   1,116.01/1,540.06 = 618.63/x
3. Step 3: Cross multiply
   1,116.01x = 1,540.06 × 618.63
4. Step 4: Simplify right side
   1,116.01x = 952,727.32
5. Step 5: Solve for x
   x = 952,727.32/1,116.01
6. Step 6: Final answer
   x = 853.69