Finding the Fourth Proportional to 80,420.72, 120,508.07 and 42,986.12

Step by Step Solution

1. Step 1: Write the proportion equation
   80,420.72 : 120,508.07 = 42,986.12 : x
2. Step 2: Convert to fraction form
   80,420.72/120,508.07 = 42,986.12/x
3. Step 3: Cross multiply
   80,420.72x = 120,508.07 × 42,986.12
4. Step 4: Simplify right side
   80,420.72x = 5,180,174,143.06
5. Step 5: Solve for x
   x = 5,180,174,143.06/80,420.72
6. Step 6: Final answer
   x = 64,413.43