Finding the Fourth Proportional to 321,638.88, 443,571.06 and 200,791.34

Step by Step Solution

1. Step 1: Write the proportion equation
   321,638.88 : 443,571.06 = 200,791.34 : x
2. Step 2: Convert to fraction form
   321,638.88/443,571.06 = 200,791.34/x
3. Step 3: Cross multiply
   321,638.88x = 443,571.06 × 200,791.34
4. Step 4: Simplify right side
   321,638.88x = 89,065,227,522.62
5. Step 5: Solve for x
   x = 89,065,227,522.62/321,638.88
6. Step 6: Final answer
   x = 276,910.64