Finding the Fourth Proportional to 839,978.94, 1,259,618.06 and 263,453.69

Step by Step Solution

1. Step 1: Write the proportion equation
   839,978.94 : 1,259,618.06 = 263,453.69 : x
2. Step 2: Convert to fraction form
   839,978.94/1,259,618.06 = 263,453.69/x
3. Step 3: Cross multiply
   839,978.94x = 1,259,618.06 × 263,453.69
4. Step 4: Simplify right side
   839,978.94x = 331,851,018,282.28
5. Step 5: Solve for x
   x = 331,851,018,282.28/839,978.94
6. Step 6: Final answer
   x = 395,070.64