Finding the Fourth Proportional to 663,098.63, 995,033.91 and 278,819.69

Step by Step Solution

1. Step 1: Write the proportion equation
   663,098.63 : 995,033.91 = 278,819.69 : x
2. Step 2: Convert to fraction form
   663,098.63/995,033.91 = 278,819.69/x
3. Step 3: Cross multiply
   663,098.63x = 995,033.91 × 278,819.69
4. Step 4: Simplify right side
   663,098.63x = 277,435,039,956.42
5. Step 5: Solve for x
   x = 277,435,039,956.42/663,098.63
6. Step 6: Final answer
   x = 418,391.82