Finding the Fourth Proportional to 443,716.86, 665,477.37 and 128,105.10

Step by Step Solution

1. Step 1: Write the proportion equation
   443,716.86 : 665,477.37 = 128,105.10 : x
2. Step 2: Convert to fraction form
   443,716.86/665,477.37 = 128,105.10/x
3. Step 3: Cross multiply
   443,716.86x = 665,477.37 × 128,105.10
4. Step 4: Simplify right side
   443,716.86x = 85,251,045,031.59
5. Step 5: Solve for x
   x = 85,251,045,031.59/443,716.86
6. Step 6: Final answer
   x = 192,129.38