Finding the Third Proportional to 64,208.50 and 99,809.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,208.50 : 99,809.50 = 99,809.50 : x
2. Step 2: Convert to fraction form
   64,208.50/99,809.50 = 99,809.50/x
3. Step 3: Cross multiply
   64,208.50x = 99,809.50 × 99,809.50
4. Step 4: Simplify right side
   64,208.50x = 9,961,936,290.25
5. Step 5: Solve for x
   x = 9,961,936,290.25/64,208.50
6. Step 6: Final answer
   x = 155,149.81