Finding the Fourth Proportional to 231,173.69, 319,018.55 and 129,199.05

Step by Step Solution

1. Step 1: Write the proportion equation
   231,173.69 : 319,018.55 = 129,199.05 : x
2. Step 2: Convert to fraction form
   231,173.69/319,018.55 = 129,199.05/x
3. Step 3: Cross multiply
   231,173.69x = 319,018.55 × 129,199.05
4. Step 4: Simplify right side
   231,173.69x = 41,216,892,946.38
5. Step 5: Solve for x
   x = 41,216,892,946.38/231,173.69
6. Step 6: Final answer
   x = 178,294.05