Finding the Fourth Proportional to 231,854.78, 321,596.55 and 225,709.31

Step by Step Solution

1. Step 1: Write the proportion equation
   231,854.78 : 321,596.55 = 225,709.31 : x
2. Step 2: Convert to fraction form
   231,854.78/321,596.55 = 225,709.31/x
3. Step 3: Cross multiply
   231,854.78x = 321,596.55 × 225,709.31
4. Step 4: Simplify right side
   231,854.78x = 72,587,335,476.32
5. Step 5: Solve for x
   x = 72,587,335,476.32/231,854.78
6. Step 6: Final answer
   x = 313,072.41