Finding the Fourth Proportional to 258,185.37, 387,278.35 and 80,693.31

Step by Step Solution

1. Step 1: Write the proportion equation
   258,185.37 : 387,278.35 = 80,693.31 : x
2. Step 2: Convert to fraction form
   258,185.37/387,278.35 = 80,693.31/x
3. Step 3: Cross multiply
   258,185.37x = 387,278.35 × 80,693.31
4. Step 4: Simplify right side
   258,185.37x = 31,250,770,016.45
5. Step 5: Solve for x
   x = 31,250,770,016.45/258,185.37
6. Step 6: Final answer
   x = 121,040.05