Finding the Fourth Proportional to 1,078.89, 1,618.35 and 309.39

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.89 : 1,618.35 = 309.39 : x
2. Step 2: Convert to fraction form
   1,078.89/1,618.35 = 309.39/x
3. Step 3: Cross multiply
   1,078.89x = 1,618.35 × 309.39
4. Step 4: Simplify right side
   1,078.89x = 500,701.31
5. Step 5: Solve for x
   x = 500,701.31/1,078.89
6. Step 6: Final answer
   x = 464.09