Finding the Fourth Proportional to 1,076.38, 1,613.58 and 418.69

Step by Step Solution

1. Step 1: Write the proportion equation
   1,076.38 : 1,613.58 = 418.69 : x
2. Step 2: Convert to fraction form
   1,076.38/1,613.58 = 418.69/x
3. Step 3: Cross multiply
   1,076.38x = 1,613.58 × 418.69
4. Step 4: Simplify right side
   1,076.38x = 675,590.26
5. Step 5: Solve for x
   x = 675,590.26/1,076.38
6. Step 6: Final answer
   x = 627.65