Finding the Fourth Proportional to 443,018.72, 611,152.98 and 289,989.56

Step by Step Solution

1. Step 1: Write the proportion equation
   443,018.72 : 611,152.98 = 289,989.56 : x
2. Step 2: Convert to fraction form
   443,018.72/611,152.98 = 289,989.56/x
3. Step 3: Cross multiply
   443,018.72x = 611,152.98 × 289,989.56
4. Step 4: Simplify right side
   443,018.72x = 177,227,983,762.89
5. Step 5: Solve for x
   x = 177,227,983,762.89/443,018.72
6. Step 6: Final answer
   x = 400,046.26