Finding the Fourth Proportional to 387,022.69, 579,031.89 and 339,278.59

Step by Step Solution

1. Step 1: Write the proportion equation
   387,022.69 : 579,031.89 = 339,278.59 : x
2. Step 2: Convert to fraction form
   387,022.69/579,031.89 = 339,278.59/x
3. Step 3: Cross multiply
   387,022.69x = 579,031.89 × 339,278.59
4. Step 4: Simplify right side
   387,022.69x = 196,453,123,204.24
5. Step 5: Solve for x
   x = 196,453,123,204.24/387,022.69
6. Step 6: Final answer
   x = 507,601.05