Finding the Third Proportional to 86,638.50 and 108,451.69

Step by Step Solution

1. Step 1: Write the proportion equation
   86,638.50 : 108,451.69 = 108,451.69 : x
2. Step 2: Convert to fraction form
   86,638.50/108,451.69 = 108,451.69/x
3. Step 3: Cross multiply
   86,638.50x = 108,451.69 × 108,451.69
4. Step 4: Simplify right side
   86,638.50x = 11,761,768,521.60
5. Step 5: Solve for x
   x = 11,761,768,521.60/86,638.50
6. Step 6: Final answer
   x = 135,756.83