Finding the Fourth Proportional to 231,678.27, 319,698.34 and 129,680.37

Step by Step Solution

1. Step 1: Write the proportion equation
   231,678.27 : 319,698.34 = 129,680.37 : x
2. Step 2: Convert to fraction form
   231,678.27/319,698.34 = 129,680.37/x
3. Step 3: Cross multiply
   231,678.27x = 319,698.34 × 129,680.37
4. Step 4: Simplify right side
   231,678.27x = 41,458,599,019.59
5. Step 5: Solve for x
   x = 41,458,599,019.59/231,678.27
6. Step 6: Final answer
   x = 178,949.02