Finding the Fourth Proportional to 408,849.51, 613,300.23 and 128,377.83

Step by Step Solution

1. Step 1: Write the proportion equation
   408,849.51 : 613,300.23 = 128,377.83 : x
2. Step 2: Convert to fraction form
   408,849.51/613,300.23 = 128,377.83/x
3. Step 3: Cross multiply
   408,849.51x = 613,300.23 × 128,377.83
4. Step 4: Simplify right side
   408,849.51x = 78,734,152,665.90
5. Step 5: Solve for x
   x = 78,734,152,665.90/408,849.51
6. Step 6: Final answer
   x = 192,574.90