Finding the Fourth Proportional to 678,499.56, 936,499.62 and 392,185.96

Step by Step Solution

1. Step 1: Write the proportion equation
   678,499.56 : 936,499.62 = 392,185.96 : x
2. Step 2: Convert to fraction form
   678,499.56/936,499.62 = 392,185.96/x
3. Step 3: Cross multiply
   678,499.56x = 936,499.62 × 392,185.96
4. Step 4: Simplify right side
   678,499.56x = 367,282,002,509.34
5. Step 5: Solve for x
   x = 367,282,002,509.34/678,499.56
6. Step 6: Final answer
   x = 541,315.02