Finding the Fourth Proportional to 839,290.92, 1,259,308.52 and 439,836.72

Step by Step Solution

1. Step 1: Write the proportion equation
   839,290.92 : 1,259,308.52 = 439,836.72 : x
2. Step 2: Convert to fraction form
   839,290.92/1,259,308.52 = 439,836.72/x
3. Step 3: Cross multiply
   839,290.92x = 1,259,308.52 × 439,836.72
4. Step 4: Simplify right side
   839,290.92x = 553,890,126,705.67
5. Step 5: Solve for x
   x = 553,890,126,705.67/839,290.92
6. Step 6: Final answer
   x = 659,950.10