Finding the Fourth Proportional to 628,164.31, 867,020.73 and 356,391.31

Step by Step Solution

1. Step 1: Write the proportion equation
   628,164.31 : 867,020.73 = 356,391.31 : x
2. Step 2: Convert to fraction form
   628,164.31/867,020.73 = 356,391.31/x
3. Step 3: Cross multiply
   628,164.31x = 867,020.73 × 356,391.31
4. Step 4: Simplify right side
   628,164.31x = 308,998,653,761.86
5. Step 5: Solve for x
   x = 308,998,653,761.86/628,164.31
6. Step 6: Final answer
   x = 491,907.37