Finding the Fourth Proportional to 665,139.12, 917,890.56 and 363,333.12

Step by Step Solution

1. Step 1: Write the proportion equation
   665,139.12 : 917,890.56 = 363,333.12 : x
2. Step 2: Convert to fraction form
   665,139.12/917,890.56 = 363,333.12/x
3. Step 3: Cross multiply
   665,139.12x = 917,890.56 × 363,333.12
4. Step 4: Simplify right side
   665,139.12x = 333,500,040,983.35
5. Step 5: Solve for x
   x = 333,500,040,983.35/665,139.12
6. Step 6: Final answer
   x = 501,398.93