Finding the Fourth Proportional to 258,999.10, 357,404.89 and 142,708.96

Step by Step Solution

1. Step 1: Write the proportion equation
   258,999.10 : 357,404.89 = 142,708.96 : x
2. Step 2: Convert to fraction form
   258,999.10/357,404.89 = 142,708.96/x
3. Step 3: Cross multiply
   258,999.10x = 357,404.89 × 142,708.96
4. Step 4: Simplify right side
   258,999.10x = 51,004,877,650.25
5. Step 5: Solve for x
   x = 51,004,877,650.25/258,999.10
6. Step 6: Final answer
   x = 196,930.72