Finding the Fourth Proportional to 405,320.10, 559,343.50 and 221,562.42

Step by Step Solution

1. Step 1: Write the proportion equation
   405,320.10 : 559,343.50 = 221,562.42 : x
2. Step 2: Convert to fraction form
   405,320.10/559,343.50 = 221,562.42/x
3. Step 3: Cross multiply
   405,320.10x = 559,343.50 × 221,562.42
4. Step 4: Simplify right side
   405,320.10x = 123,929,499,471.27
5. Step 5: Solve for x
   x = 123,929,499,471.27/405,320.10
6. Step 6: Final answer
   x = 305,757.10