Finding the Fourth Proportional to 123,424.77, 170,198.78 and 105,578.85

Step by Step Solution

1. Step 1: Write the proportion equation
   123,424.77 : 170,198.78 = 105,578.85 : x
2. Step 2: Convert to fraction form
   123,424.77/170,198.78 = 105,578.85/x
3. Step 3: Cross multiply
   123,424.77x = 170,198.78 × 105,578.85
4. Step 4: Simplify right side
   123,424.77x = 17,969,390,935.91
5. Step 5: Solve for x
   x = 17,969,390,935.91/123,424.77
6. Step 6: Final answer
   x = 145,589.83