Finding the Third Proportional to 81,289.50 and 108,730.50

Step by Step Solution

1. Step 1: Write the proportion equation
   81,289.50 : 108,730.50 = 108,730.50 : x
2. Step 2: Convert to fraction form
   81,289.50/108,730.50 = 108,730.50/x
3. Step 3: Cross multiply
   81,289.50x = 108,730.50 × 108,730.50
4. Step 4: Simplify right side
   81,289.50x = 11,822,321,630.25
5. Step 5: Solve for x
   x = 11,822,321,630.25/81,289.50
6. Step 6: Final answer
   x = 145,434.79