Finding the Fourth Proportional to 1,086.18, 1,627.71 and 618.03

Step by Step Solution

1. Step 1: Write the proportion equation
   1,086.18 : 1,627.71 = 618.03 : x
2. Step 2: Convert to fraction form
   1,086.18/1,627.71 = 618.03/x
3. Step 3: Cross multiply
   1,086.18x = 1,627.71 × 618.03
4. Step 4: Simplify right side
   1,086.18x = 1,005,967.51
5. Step 5: Solve for x
   x = 1,005,967.51/1,086.18
6. Step 6: Final answer
   x = 926.15