Finding the Fourth Proportional to 144,198.72, 199,087.83 and 129,065.10

Step by Step Solution

1. Step 1: Write the proportion equation
   144,198.72 : 199,087.83 = 129,065.10 : x
2. Step 2: Convert to fraction form
   144,198.72/199,087.83 = 129,065.10/x
3. Step 3: Cross multiply
   144,198.72x = 199,087.83 × 129,065.10
4. Step 4: Simplify right side
   144,198.72x = 25,695,290,687.73
5. Step 5: Solve for x
   x = 25,695,290,687.73/144,198.72
6. Step 6: Final answer
   x = 178,193.61