Finding the Fourth Proportional to 1,011.33, 1,395.54 and 618.27

Step by Step Solution

1. Step 1: Write the proportion equation
   1,011.33 : 1,395.54 = 618.27 : x
2. Step 2: Convert to fraction form
   1,011.33/1,395.54 = 618.27/x
3. Step 3: Cross multiply
   1,011.33x = 1,395.54 × 618.27
4. Step 4: Simplify right side
   1,011.33x = 862,820.52
5. Step 5: Solve for x
   x = 862,820.52/1,011.33
6. Step 6: Final answer
   x = 853.15