Finding the Fourth Proportional to 321,611.41, 443,678.20 and 200,782.50

Step by Step Solution

1. Step 1: Write the proportion equation
   321,611.41 : 443,678.20 = 200,782.50 : x
2. Step 2: Convert to fraction form
   321,611.41/443,678.20 = 200,782.50/x
3. Step 3: Cross multiply
   321,611.41x = 443,678.20 × 200,782.50
4. Step 4: Simplify right side
   321,611.41x = 89,082,818,191.50
5. Step 5: Solve for x
   x = 89,082,818,191.50/321,611.41
6. Step 6: Final answer
   x = 276,988.99