Finding the Fourth Proportional to 443,890.62, 666,003.69 and 266,520.96

Step by Step Solution

1. Step 1: Write the proportion equation
   443,890.62 : 666,003.69 = 266,520.96 : x
2. Step 2: Convert to fraction form
   443,890.62/666,003.69 = 266,520.96/x
3. Step 3: Cross multiply
   443,890.62x = 666,003.69 × 266,520.96
4. Step 4: Simplify right side
   443,890.62x = 177,503,942,822.34
5. Step 5: Solve for x
   x = 177,503,942,822.34/443,890.62
6. Step 6: Final answer
   x = 399,882.17