Finding the Fourth Proportional to 685,945.05, 946,604.24 and 384,139.05

Step by Step Solution

1. Step 1: Write the proportion equation
   685,945.05 : 946,604.24 = 384,139.05 : x
2. Step 2: Convert to fraction form
   685,945.05/946,604.24 = 384,139.05/x
3. Step 3: Cross multiply
   685,945.05x = 946,604.24 × 384,139.05
4. Step 4: Simplify right side
   685,945.05x = 363,627,653,479.57
5. Step 5: Solve for x
   x = 363,627,653,479.57/685,945.05
6. Step 6: Final answer
   x = 530,111.93