Finding the Fourth Proportional to 839,300.30, 1,259,322.57 and 439,846.10

Step by Step Solution

1. Step 1: Write the proportion equation
   839,300.30 : 1,259,322.57 = 439,846.10 : x
2. Step 2: Convert to fraction form
   839,300.30/1,259,322.57 = 439,846.10/x
3. Step 3: Cross multiply
   839,300.30x = 1,259,322.57 × 439,846.10
4. Step 4: Simplify right side
   839,300.30x = 553,908,114,759.86
5. Step 5: Solve for x
   x = 553,908,114,759.86/839,300.30
6. Step 6: Final answer
   x = 659,964.16