Finding the Fourth Proportional to 387,020.69, 579,028.89 and 339,276.59

Step by Step Solution

1. Step 1: Write the proportion equation
   387,020.69 : 579,028.89 = 339,276.59 : x
2. Step 2: Convert to fraction form
   387,020.69/579,028.89 = 339,276.59/x
3. Step 3: Cross multiply
   387,020.69x = 579,028.89 × 339,276.59
4. Step 4: Simplify right side
   387,020.69x = 196,450,947,310.69
5. Step 5: Solve for x
   x = 196,450,947,310.69/387,020.69
6. Step 6: Final answer
   x = 507,598.05