Finding the Fourth Proportional to 269,643.30, 404,562.15 and 259,923.30

Step by Step Solution

1. Step 1: Write the proportion equation
   269,643.30 : 404,562.15 = 259,923.30 : x
2. Step 2: Convert to fraction form
   269,643.30/404,562.15 = 259,923.30/x
3. Step 3: Cross multiply
   269,643.30x = 404,562.15 × 259,923.30
4. Step 4: Simplify right side
   269,643.30x = 105,155,129,083.10
5. Step 5: Solve for x
   x = 105,155,129,083.10/269,643.30
6. Step 6: Final answer
   x = 389,978.65