Finding the Fourth Proportional to 258,369.98, 387,529.91 and 78,456.96

Step by Step Solution

1. Step 1: Write the proportion equation
   258,369.98 : 387,529.91 = 78,456.96 : x
2. Step 2: Convert to fraction form
   258,369.98/387,529.91 = 78,456.96/x
3. Step 3: Cross multiply
   258,369.98x = 387,529.91 × 78,456.96
4. Step 4: Simplify right side
   258,369.98x = 30,404,418,843.82
5. Step 5: Solve for x
   x = 30,404,418,843.82/258,369.98
6. Step 6: Final answer
   x = 117,677.83