Finding the Third Proportional to 64,690.50 and 86,305.50

Step by Step Solution

1. Step 1: Write the proportion equation
   64,690.50 : 86,305.50 = 86,305.50 : x
2. Step 2: Convert to fraction form
   64,690.50/86,305.50 = 86,305.50/x
3. Step 3: Cross multiply
   64,690.50x = 86,305.50 × 86,305.50
4. Step 4: Simplify right side
   64,690.50x = 7,448,639,330.25
5. Step 5: Solve for x
   x = 7,448,639,330.25/64,690.50
6. Step 6: Final answer
   x = 115,142.71