Finding the Fourth Proportional to 420,067.89, 579,728.07 and 238,836.69

Step by Step Solution

1. Step 1: Write the proportion equation
   420,067.89 : 579,728.07 = 238,836.69 : x
2. Step 2: Convert to fraction form
   420,067.89/579,728.07 = 238,836.69/x
3. Step 3: Cross multiply
   420,067.89x = 579,728.07 × 238,836.69
4. Step 4: Simplify right side
   420,067.89x = 138,460,333,338.89
5. Step 5: Solve for x
   x = 138,460,333,338.89/420,067.89
6. Step 6: Final answer
   x = 329,614.18