Finding the Fourth Proportional to 231,795.81, 319,851.72 and 129,807.09

Step by Step Solution

1. Step 1: Write the proportion equation
   231,795.81 : 319,851.72 = 129,807.09 : x
2. Step 2: Convert to fraction form
   231,795.81/319,851.72 = 129,807.09/x
3. Step 3: Cross multiply
   231,795.81x = 319,851.72 × 129,807.09
4. Step 4: Simplify right side
   231,795.81x = 41,519,021,004.69
5. Step 5: Solve for x
   x = 41,519,021,004.69/231,795.81
6. Step 6: Final answer
   x = 179,118.95