Finding the Fourth Proportional to 419,403.36, 578,783.30 and 238,111.59

Step by Step Solution

1. Step 1: Write the proportion equation
   419,403.36 : 578,783.30 = 238,111.59 : x
2. Step 2: Convert to fraction form
   419,403.36/578,783.30 = 238,111.59/x
3. Step 3: Cross multiply
   419,403.36x = 578,783.30 × 238,111.59
4. Step 4: Simplify right side
   419,403.36x = 137,815,010,637.89
5. Step 5: Solve for x
   x = 137,815,010,637.89/419,403.36
6. Step 6: Final answer
   x = 328,597.77