Finding the Fourth Proportional to 2,079.21, 3,118.82 and 618.37

Step by Step Solution

1. Step 1: Write the proportion equation
   2,079.21 : 3,118.82 = 618.37 : x
2. Step 2: Convert to fraction form
   2,079.21/3,118.82 = 618.37/x
3. Step 3: Cross multiply
   2,079.21x = 3,118.82 × 618.37
4. Step 4: Simplify right side
   2,079.21x = 1,928,584.72
5. Step 5: Solve for x
   x = 1,928,584.72/2,079.21
6. Step 6: Final answer
   x = 927.56