Finding the Fourth Proportional to 258,369.18, 387,528.72 and 78,456.17

Step by Step Solution

1. Step 1: Write the proportion equation
   258,369.18 : 387,528.72 = 78,456.17 : x
2. Step 2: Convert to fraction form
   258,369.18/387,528.72 = 78,456.17/x
3. Step 3: Cross multiply
   258,369.18x = 387,528.72 × 78,456.17
4. Step 4: Simplify right side
   258,369.18x = 30,404,016,904.35
5. Step 5: Solve for x
   x = 30,404,016,904.35/258,369.18
6. Step 6: Final answer
   x = 117,676.64