Finding the Fourth Proportional to 728,783.57, 1,005,718.72 and 406,493.42

Step by Step Solution

1. Step 1: Write the proportion equation
   728,783.57 : 1,005,718.72 = 406,493.42 : x
2. Step 2: Convert to fraction form
   728,783.57/1,005,718.72 = 406,493.42/x
3. Step 3: Cross multiply
   728,783.57x = 1,005,718.72 × 406,493.42
4. Step 4: Simplify right side
   728,783.57x = 408,818,040,018.36
5. Step 5: Solve for x
   x = 408,818,040,018.36/728,783.57
6. Step 6: Final answer
   x = 560,959.46