Finding the Fourth Proportional to 321,638.42, 443,570.46 and 200,790.84

Step by Step Solution

1. Step 1: Write the proportion equation
   321,638.42 : 443,570.46 = 200,790.84 : x
2. Step 2: Convert to fraction form
   321,638.42/443,570.46 = 200,790.84/x
3. Step 3: Cross multiply
   321,638.42x = 443,570.46 × 200,790.84
4. Step 4: Simplify right side
   321,638.42x = 89,064,885,262.59
5. Step 5: Solve for x
   x = 89,064,885,262.59/321,638.42
6. Step 6: Final answer
   x = 276,909.97