Finding the Fourth Proportional to 1,078.82, 1,618.06 and 348.30

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.82 : 1,618.06 = 348.30 : x
2. Step 2: Convert to fraction form
   1,078.82/1,618.06 = 348.30/x
3. Step 3: Cross multiply
   1,078.82x = 1,618.06 × 348.30
4. Step 4: Simplify right side
   1,078.82x = 563,570.30
5. Step 5: Solve for x
   x = 563,570.30/1,078.82
6. Step 6: Final answer
   x = 522.40