Finding the Fourth Proportional to 80,424.49, 120,513.69 and 42,989.87

Step by Step Solution

1. Step 1: Write the proportion equation
   80,424.49 : 120,513.69 = 42,989.87 : x
2. Step 2: Convert to fraction form
   80,424.49/120,513.69 = 42,989.87/x
3. Step 3: Cross multiply
   80,424.49x = 120,513.69 × 42,989.87
4. Step 4: Simplify right side
   80,424.49x = 5,180,867,866.32
5. Step 5: Solve for x
   x = 5,180,867,866.32/80,424.49
6. Step 6: Final answer
   x = 64,419.03