Finding the Third Proportional to 64,639.50 and 99,685.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,639.50 : 99,685.50 = 99,685.50 : x
2. Step 2: Convert to fraction form
   64,639.50/99,685.50 = 99,685.50/x
3. Step 3: Cross multiply
   64,639.50x = 99,685.50 × 99,685.50
4. Step 4: Simplify right side
   64,639.50x = 9,937,198,910.25
5. Step 5: Solve for x
   x = 9,937,198,910.25/64,639.50
6. Step 6: Final answer
   x = 153,732.61