Finding the Fourth Proportional to 89,790.76, 134,776.86 and 80,965

Step by Step Solution

1. Step 1: Write the proportion equation
   89,790.76 : 134,776.86 = 80,965 : x
2. Step 2: Convert to fraction form
   89,790.76/134,776.86 = 80,965/x
3. Step 3: Cross multiply
   89,790.76x = 134,776.86 × 80,965
4. Step 4: Simplify right side
   89,790.76x = 10,912,208,469.90
5. Step 5: Solve for x
   x = 10,912,208,469.90/89,790.76
6. Step 6: Final answer
   x = 121,529.30