Finding the Third Proportional to 66,548.50 and 73,109.50

Step by Step Solution

1. Step 1: Write the proportion equation
   66,548.50 : 73,109.50 = 73,109.50 : x
2. Step 2: Convert to fraction form
   66,548.50/73,109.50 = 73,109.50/x
3. Step 3: Cross multiply
   66,548.50x = 73,109.50 × 73,109.50
4. Step 4: Simplify right side
   66,548.50x = 5,344,998,990.25
5. Step 5: Solve for x
   x = 5,344,998,990.25/66,548.50
6. Step 6: Final answer
   x = 80,317.35