Finding the Fourth Proportional to 80,099.16, 120,166.96 and 42,639.50

Step by Step Solution

1. Step 1: Write the proportion equation
   80,099.16 : 120,166.96 = 42,639.50 : x
2. Step 2: Convert to fraction form
   80,099.16/120,166.96 = 42,639.50/x
3. Step 3: Cross multiply
   80,099.16x = 120,166.96 × 42,639.50
4. Step 4: Simplify right side
   80,099.16x = 5,123,858,596.68
5. Step 5: Solve for x
   x = 5,123,858,596.68/80,099.16
6. Step 6: Final answer
   x = 63,968.94