Finding the Fourth Proportional to 443,854.61, 665,786.78 and 128,314.25

Step by Step Solution

1. Step 1: Write the proportion equation
   443,854.61 : 665,786.78 = 128,314.25 : x
2. Step 2: Convert to fraction form
   443,854.61/665,786.78 = 128,314.25/x
3. Step 3: Cross multiply
   443,854.61x = 665,786.78 × 128,314.25
4. Step 4: Simplify right side
   443,854.61x = 85,429,930,694.04
5. Step 5: Solve for x
   x = 85,429,930,694.04/443,854.61
6. Step 6: Final answer
   x = 192,472.78