Finding the Fourth Proportional to 258,196.63, 356,304.21 and 143,472.31

Step by Step Solution

1. Step 1: Write the proportion equation
   258,196.63 : 356,304.21 = 143,472.31 : x
2. Step 2: Convert to fraction form
   258,196.63/356,304.21 = 143,472.31/x
3. Step 3: Cross multiply
   258,196.63x = 356,304.21 × 143,472.31
4. Step 4: Simplify right side
   258,196.63x = 51,119,788,071.43
5. Step 5: Solve for x
   x = 51,119,788,071.43/258,196.63
6. Step 6: Final answer
   x = 197,987.82