Finding the Fourth Proportional to 258,369.31, 387,528.91 and 78,456.29

Step by Step Solution

1. Step 1: Write the proportion equation
   258,369.31 : 387,528.91 = 78,456.29 : x
2. Step 2: Convert to fraction form
   258,369.31/387,528.91 = 78,456.29/x
3. Step 3: Cross multiply
   258,369.31x = 387,528.91 × 78,456.29
4. Step 4: Simplify right side
   258,369.31x = 30,404,080,154.06
5. Step 5: Solve for x
   x = 30,404,080,154.06/258,369.31
6. Step 6: Final answer
   x = 117,676.83