Finding the Fourth Proportional to 81,737, 121,890.22 and 80,989.62

Step by Step Solution

1. Step 1: Write the proportion equation
   81,737 : 121,890.22 = 80,989.62 : x
2. Step 2: Convert to fraction form
   81,737/121,890.22 = 80,989.62/x
3. Step 3: Cross multiply
   81,737x = 121,890.22 × 80,989.62
4. Step 4: Simplify right side
   81,737x = 9,871,842,599.52
5. Step 5: Solve for x
   x = 9,871,842,599.52/81,737
6. Step 6: Final answer
   x = 120,775.69