Finding the Third Proportional to 66,517.50 and 73,078.50

Step by Step Solution

1. Step 1: Write the proportion equation
   66,517.50 : 73,078.50 = 73,078.50 : x
2. Step 2: Convert to fraction form
   66,517.50/73,078.50 = 73,078.50/x
3. Step 3: Cross multiply
   66,517.50x = 73,078.50 × 73,078.50
4. Step 4: Simplify right side
   66,517.50x = 5,340,467,162.25
5. Step 5: Solve for x
   x = 5,340,467,162.25/66,517.50
6. Step 6: Final answer
   x = 80,286.65