Finding the Fourth Proportional to 443,849.25, 665,778.72 and 128,308.89

Step by Step Solution

1. Step 1: Write the proportion equation
   443,849.25 : 665,778.72 = 128,308.89 : x
2. Step 2: Convert to fraction form
   443,849.25/665,778.72 = 128,308.89/x
3. Step 3: Cross multiply
   443,849.25x = 665,778.72 × 128,308.89
4. Step 4: Simplify right side
   443,849.25x = 85,425,328,548.82
5. Step 5: Solve for x
   x = 85,425,328,548.82/443,849.25
6. Step 6: Final answer
   x = 192,464.74