Finding the Fourth Proportional to 80,216.28, 120,288.87 and 42,769.38

Step by Step Solution

1. Step 1: Write the proportion equation
   80,216.28 : 120,288.87 = 42,769.38 : x
2. Step 2: Convert to fraction form
   80,216.28/120,288.87 = 42,769.38/x
3. Step 3: Cross multiply
   80,216.28x = 120,288.87 × 42,769.38
4. Step 4: Simplify right side
   80,216.28x = 5,144,680,390.80
5. Step 5: Solve for x
   x = 5,144,680,390.80/80,216.28
6. Step 6: Final answer
   x = 64,135.12