Finding the Third Proportional to 39,424.50 and 80,689.50

Step by Step Solution

1. Step 1: Write the proportion equation
   39,424.50 : 80,689.50 = 80,689.50 : x
2. Step 2: Convert to fraction form
   39,424.50/80,689.50 = 80,689.50/x
3. Step 3: Cross multiply
   39,424.50x = 80,689.50 × 80,689.50
4. Step 4: Simplify right side
   39,424.50x = 6,510,795,410.25
5. Step 5: Solve for x
   x = 6,510,795,410.25/39,424.50
6. Step 6: Final answer
   x = 165,145.92