Finding the Fourth Proportional to 1,238,517.42, 1,857,759.59 and 339,959.31

Step by Step Solution

1. Step 1: Write the proportion equation
   1,238,517.42 : 1,857,759.59 = 339,959.31 : x
2. Step 2: Convert to fraction form
   1,238,517.42/1,857,759.59 = 339,959.31/x
3. Step 3: Cross multiply
   1,238,517.42x = 1,857,759.59 × 339,959.31
4. Step 4: Simplify right side
   1,238,517.42x = 631,562,666,662.49
5. Step 5: Solve for x
   x = 631,562,666,662.49/1,238,517.42
6. Step 6: Final answer
   x = 509,934.42