Finding the Fourth Proportional to 2,078.88, 3,118.76 and 618.12

Step by Step Solution

1. Step 1: Write the proportion equation
   2,078.88 : 3,118.76 = 618.12 : x
2. Step 2: Convert to fraction form
   2,078.88/3,118.76 = 618.12/x
3. Step 3: Cross multiply
   2,078.88x = 3,118.76 × 618.12
4. Step 4: Simplify right side
   2,078.88x = 1,927,767.93
5. Step 5: Solve for x
   x = 1,927,767.93/2,078.88
6. Step 6: Final answer
   x = 927.31