Finding the Fourth Proportional to 443,692.08, 665,406.72 and 128,151.72

Step by Step Solution

1. Step 1: Write the proportion equation
   443,692.08 : 665,406.72 = 128,151.72 : x
2. Step 2: Convert to fraction form
   443,692.08/665,406.72 = 128,151.72/x
3. Step 3: Cross multiply
   443,692.08x = 665,406.72 × 128,151.72
4. Step 4: Simplify right side
   443,692.08x = 85,273,015,667.56
5. Step 5: Solve for x
   x = 85,273,015,667.56/443,692.08
6. Step 6: Final answer
   x = 192,189.63