Finding the Fourth Proportional to 1,081.27, 1,620.38 and 618.35

Step by Step Solution

1. Step 1: Write the proportion equation
   1,081.27 : 1,620.38 = 618.35 : x
2. Step 2: Convert to fraction form
   1,081.27/1,620.38 = 618.35/x
3. Step 3: Cross multiply
   1,081.27x = 1,620.38 × 618.35
4. Step 4: Simplify right side
   1,081.27x = 1,001,965.25
5. Step 5: Solve for x
   x = 1,001,965.25/1,081.27
6. Step 6: Final answer
   x = 926.66