Finding the Fourth Proportional to 258,499.50, 356,729.31 and 145,323.06

Step by Step Solution

1. Step 1: Write the proportion equation
   258,499.50 : 356,729.31 = 145,323.06 : x
2. Step 2: Convert to fraction form
   258,499.50/356,729.31 = 145,323.06/x
3. Step 3: Cross multiply
   258,499.50x = 356,729.31 × 145,323.06
4. Step 4: Simplify right side
   258,499.50x = 51,840,994,920.89
5. Step 5: Solve for x
   x = 51,840,994,920.89/258,499.50
6. Step 6: Final answer
   x = 200,545.82