Finding the Fourth Proportional to 2,079.69, 3,120.06 and 618.81

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.69 : 3,120.06 = 618.81 : x
2. Step 2: Convert to fraction form
   2,079.69/3,120.06 = 618.81/x
3. Step 3: Cross multiply
   2,079.69x = 3,120.06 × 618.81
4. Step 4: Simplify right side
   2,079.69x = 1,930,708.73
5. Step 5: Solve for x
   x = 1,930,708.73/2,079.69
6. Step 6: Final answer
   x = 928.37