Finding the Fourth Proportional to 80,424.24, 120,513.31 and 42,989.62

Step by Step Solution

1. Step 1: Write the proportion equation
   80,424.24 : 120,513.31 = 42,989.62 : x
2. Step 2: Convert to fraction form
   80,424.24/120,513.31 = 42,989.62/x
3. Step 3: Cross multiply
   80,424.24x = 120,513.31 × 42,989.62
4. Step 4: Simplify right side
   80,424.24x = 5,180,821,401.84
5. Step 5: Solve for x
   x = 5,180,821,401.84/80,424.24
6. Step 6: Final answer
   x = 64,418.66