Finding the Fourth Proportional to 418,412.84, 577,687.78 and 321,443.98

Step by Step Solution

1. Step 1: Write the proportion equation
   418,412.84 : 577,687.78 = 321,443.98 : x
2. Step 2: Convert to fraction form
   418,412.84/577,687.78 = 321,443.98/x
3. Step 3: Cross multiply
   418,412.84x = 577,687.78 × 321,443.98
4. Step 4: Simplify right side
   418,412.84x = 185,694,259,200.56
5. Step 5: Solve for x
   x = 185,694,259,200.56/418,412.84
6. Step 6: Final answer
   x = 443,806.31