Finding the Fourth Proportional to 1,078.56, 1,618.10 and 338.15

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.56 : 1,618.10 = 338.15 : x
2. Step 2: Convert to fraction form
   1,078.56/1,618.10 = 338.15/x
3. Step 3: Cross multiply
   1,078.56x = 1,618.10 × 338.15
4. Step 4: Simplify right side
   1,078.56x = 547,150.73
5. Step 5: Solve for x
   x = 547,150.73/1,078.56
6. Step 6: Final answer
   x = 507.30