Finding the Fourth Proportional to 443,834.49, 665,756.59 and 128,294.13

Step by Step Solution

1. Step 1: Write the proportion equation
   443,834.49 : 665,756.59 = 128,294.13 : x
2. Step 2: Convert to fraction form
   443,834.49/665,756.59 = 128,294.13/x
3. Step 3: Cross multiply
   443,834.49x = 665,756.59 × 128,294.13
4. Step 4: Simplify right side
   443,834.49x = 85,412,658,856.30
5. Step 5: Solve for x
   x = 85,412,658,856.30/443,834.49
6. Step 6: Final answer
   x = 192,442.59