Finding the Third Proportional to 54,309.75 and 80,617.88

Step by Step Solution

1. Step 1: Write the proportion equation
   54,309.75 : 80,617.88 = 80,617.88 : x
2. Step 2: Convert to fraction form
   54,309.75/80,617.88 = 80,617.88/x
3. Step 3: Cross multiply
   54,309.75x = 80,617.88 × 80,617.88
4. Step 4: Simplify right side
   54,309.75x = 6,499,241,769.52
5. Step 5: Solve for x
   x = 6,499,241,769.52/54,309.75
6. Step 6: Final answer
   x = 119,669.89