Finding the Fourth Proportional to 679,758.98, 1,019,042.31 and 258,754.82

Step by Step Solution

1. Step 1: Write the proportion equation
   679,758.98 : 1,019,042.31 = 258,754.82 : x
2. Step 2: Convert to fraction form
   679,758.98/1,019,042.31 = 258,754.82/x
3. Step 3: Cross multiply
   679,758.98x = 1,019,042.31 × 258,754.82
4. Step 4: Simplify right side
   679,758.98x = 263,682,109,496.43
5. Step 5: Solve for x
   x = 263,682,109,496.43/679,758.98
6. Step 6: Final answer
   x = 387,905.30