Finding the Fourth Proportional to 1,016.55, 1,402.31 and 618.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,016.55 : 1,402.31 = 618.03 : x
2. Step 2: Convert to fraction form
   1,016.55/1,402.31 = 618.03/x
3. Step 3: Cross multiply
   1,016.55x = 1,402.31 × 618.03
4. Step 4: Simplify right side
   1,016.55x = 866,671.19
5. Step 5: Solve for x
   x = 866,671.19/1,016.55
6. Step 6: Final answer
   x = 852.56