Finding the Fourth Proportional to 1,078.43, 1,616.83 and 429.62

Step by Step Solution

1. Step 1: Write the proportion equation
   1,078.43 : 1,616.83 = 429.62 : x
2. Step 2: Convert to fraction form
   1,078.43/1,616.83 = 429.62/x
3. Step 3: Cross multiply
   1,078.43x = 1,616.83 × 429.62
4. Step 4: Simplify right side
   1,078.43x = 694,613.35
5. Step 5: Solve for x
   x = 694,613.35/1,078.43
6. Step 6: Final answer
   x = 644.10