Finding the Fourth Proportional to 2,079.57, 3,119.52 and 618.72

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.57 : 3,119.52 = 618.72 : x
2. Step 2: Convert to fraction form
   2,079.57/3,119.52 = 618.72/x
3. Step 3: Cross multiply
   2,079.57x = 3,119.52 × 618.72
4. Step 4: Simplify right side
   2,079.57x = 1,930,109.41
5. Step 5: Solve for x
   x = 1,930,109.41/2,079.57
6. Step 6: Final answer
   x = 928.13