Finding the Fourth Proportional to 723,530, 998,471.40 and 405,578

Step by Step Solution

1. Step 1: Write the proportion equation
   723,530 : 998,471.40 = 405,578 : x
2. Step 2: Convert to fraction form
   723,530/998,471.40 = 405,578/x
3. Step 3: Cross multiply
   723,530x = 998,471.40 × 405,578
4. Step 4: Simplify right side
   723,530x = 404,958,033,469.20
5. Step 5: Solve for x
   x = 404,958,033,469.20/723,530
6. Step 6: Final answer
   x = 559,697.64