Finding the Fourth Proportional to 80,215.28, 120,287.38 and 42,768.38

Step by Step Solution

1. Step 1: Write the proportion equation
   80,215.28 : 120,287.38 = 42,768.38 : x
2. Step 2: Convert to fraction form
   80,215.28/120,287.38 = 42,768.38/x
3. Step 3: Cross multiply
   80,215.28x = 120,287.38 × 42,768.38
4. Step 4: Simplify right side
   80,215.28x = 5,144,495,561.77
5. Step 5: Solve for x
   x = 5,144,495,561.77/80,215.28
6. Step 6: Final answer
   x = 64,133.61