Finding the Fourth Proportional to 80,046.96, 120,142.80 and 42,638.28

Step by Step Solution

1. Step 1: Write the proportion equation
   80,046.96 : 120,142.80 = 42,638.28 : x
2. Step 2: Convert to fraction form
   80,046.96/120,142.80 = 42,638.28/x
3. Step 3: Cross multiply
   80,046.96x = 120,142.80 × 42,638.28
4. Step 4: Simplify right side
   80,046.96x = 5,122,682,346.38
5. Step 5: Solve for x
   x = 5,122,682,346.38/80,046.96
6. Step 6: Final answer
   x = 63,995.96