Finding the Third Proportional to 30,712.50 and 64,519.50

Step by Step Solution

1. Step 1: Write the proportion equation
   30,712.50 : 64,519.50 = 64,519.50 : x
2. Step 2: Convert to fraction form
   30,712.50/64,519.50 = 64,519.50/x
3. Step 3: Cross multiply
   30,712.50x = 64,519.50 × 64,519.50
4. Step 4: Simplify right side
   30,712.50x = 4,162,765,880.25
5. Step 5: Solve for x
   x = 4,162,765,880.25/30,712.50
6. Step 6: Final answer
   x = 135,539.79