Finding the Third Proportional to 81,036 and 128,215.50

Step by Step Solution

1. Step 1: Write the proportion equation
   81,036 : 128,215.50 = 128,215.50 : x
2. Step 2: Convert to fraction form
   81,036/128,215.50 = 128,215.50/x
3. Step 3: Cross multiply
   81,036x = 128,215.50 × 128,215.50
4. Step 4: Simplify right side
   81,036x = 16,439,214,440.25
5. Step 5: Solve for x
   x = 16,439,214,440.25/81,036
6. Step 6: Final answer
   x = 202,863.10