Finding the Fourth Proportional to 557,724, 769,638.06 and 303,069.72

Step by Step Solution

1. Step 1: Write the proportion equation
   557,724 : 769,638.06 = 303,069.72 : x
2. Step 2: Convert to fraction form
   557,724/769,638.06 = 303,069.72/x
3. Step 3: Cross multiply
   557,724x = 769,638.06 × 303,069.72
4. Step 4: Simplify right side
   557,724x = 233,253,991,345.54
5. Step 5: Solve for x
   x = 233,253,991,345.54/557,724
6. Step 6: Final answer
   x = 418,224.77