Finding the Fourth Proportional to 404,139, 557,423.46 and 343,287.48

Step by Step Solution

1. Step 1: Write the proportion equation
   404,139 : 557,423.46 = 343,287.48 : x
2. Step 2: Convert to fraction form
   404,139/557,423.46 = 343,287.48/x
3. Step 3: Cross multiply
   404,139x = 557,423.46 × 343,287.48
4. Step 4: Simplify right side
   404,139x = 191,356,494,876.28
5. Step 5: Solve for x
   x = 191,356,494,876.28/404,139
6. Step 6: Final answer
   x = 473,491.78