Finding the Fourth Proportional to 426,105.67, 587,815.18 and 278,843.35

Step by Step Solution

1. Step 1: Write the proportion equation
   426,105.67 : 587,815.18 = 278,843.35 : x
2. Step 2: Convert to fraction form
   426,105.67/587,815.18 = 278,843.35/x
3. Step 3: Cross multiply
   426,105.67x = 587,815.18 × 278,843.35
4. Step 4: Simplify right side
   426,105.67x = 163,908,355,055.38
5. Step 5: Solve for x
   x = 163,908,355,055.38/426,105.67
6. Step 6: Final answer
   x = 384,665.98