Finding the Fourth Proportional to 443,910.96, 665,885.88 and 128,399.76

Step by Step Solution

1. Step 1: Write the proportion equation
   443,910.96 : 665,885.88 = 128,399.76 : x
2. Step 2: Convert to fraction form
   443,910.96/665,885.88 = 128,399.76/x
3. Step 3: Cross multiply
   443,910.96x = 665,885.88 × 128,399.76
4. Step 4: Simplify right side
   443,910.96x = 85,499,587,179.39
5. Step 5: Solve for x
   x = 85,499,587,179.39/443,910.96
6. Step 6: Final answer
   x = 192,605.26