Finding the Fourth Proportional to 401,905.50, 554,629.59 and 223,057.50

Step by Step Solution

1. Step 1: Write the proportion equation
   401,905.50 : 554,629.59 = 223,057.50 : x
2. Step 2: Convert to fraction form
   401,905.50/554,629.59 = 223,057.50/x
3. Step 3: Cross multiply
   401,905.50x = 554,629.59 × 223,057.50
4. Step 4: Simplify right side
   401,905.50x = 123,714,289,771.43
5. Step 5: Solve for x
   x = 123,714,289,771.43/401,905.50
6. Step 6: Final answer
   x = 307,819.35