Finding the Fourth Proportional to 404,288.09, 606,571.97 and 138,235.89

Step by Step Solution

1. Step 1: Write the proportion equation
   404,288.09 : 606,571.97 = 138,235.89 : x
2. Step 2: Convert to fraction form
   404,288.09/606,571.97 = 138,235.89/x
3. Step 3: Cross multiply
   404,288.09x = 606,571.97 × 138,235.89
4. Step 4: Simplify right side
   404,288.09x = 83,850,016,122.00
5. Step 5: Solve for x
   x = 83,850,016,122.00/404,288.09
6. Step 6: Final answer
   x = 207,401.65