Finding the Fourth Proportional to 258,620.31, 356,892.59 and 145,443.06

Step by Step Solution

1. Step 1: Write the proportion equation
   258,620.31 : 356,892.59 = 145,443.06 : x
2. Step 2: Convert to fraction form
   258,620.31/356,892.59 = 145,443.06/x
3. Step 3: Cross multiply
   258,620.31x = 356,892.59 × 145,443.06
4. Step 4: Simplify right side
   258,620.31x = 51,907,550,744.53
5. Step 5: Solve for x
   x = 51,907,550,744.53/258,620.31
6. Step 6: Final answer
   x = 200,709.49