Finding the Fourth Proportional to 1,288,245.96, 1,932,436.56 and 389,664.78

Step by Step Solution

1. Step 1: Write the proportion equation
   1,288,245.96 : 1,932,436.56 = 389,664.78 : x
2. Step 2: Convert to fraction form
   1,288,245.96/1,932,436.56 = 389,664.78/x
3. Step 3: Cross multiply
   1,288,245.96x = 1,932,436.56 × 389,664.78
4. Step 4: Simplify right side
   1,288,245.96x = 753,002,467,016.36
5. Step 5: Solve for x
   x = 753,002,467,016.36/1,288,245.96
6. Step 6: Final answer
   x = 584,517.62