Finding the Fourth Proportional to 404,390.38, 558,039.25 and 220,618.01

Step by Step Solution

1. Step 1: Write the proportion equation
   404,390.38 : 558,039.25 = 220,618.01 : x
2. Step 2: Convert to fraction form
   404,390.38/558,039.25 = 220,618.01/x
3. Step 3: Cross multiply
   404,390.38x = 558,039.25 × 220,618.01
4. Step 4: Simplify right side
   404,390.38x = 123,113,505,495.15
5. Step 5: Solve for x
   x = 123,113,505,495.15/404,390.38
6. Step 6: Final answer
   x = 304,442.22