Finding the Fourth Proportional to 685,879.82, 946,513.98 and 379,976.07

Step by Step Solution

1. Step 1: Write the proportion equation
   685,879.82 : 946,513.98 = 379,976.07 : x
2. Step 2: Convert to fraction form
   685,879.82/946,513.98 = 379,976.07/x
3. Step 3: Cross multiply
   685,879.82x = 946,513.98 × 379,976.07
4. Step 4: Simplify right side
   685,879.82x = 359,652,662,320.46
5. Step 5: Solve for x
   x = 359,652,662,320.46/685,879.82
6. Step 6: Final answer
   x = 524,366.88