Finding the Third Proportional to 81,109.50 and 108,495.75

Step by Step Solution

1. Step 1: Write the proportion equation
   81,109.50 : 108,495.75 = 108,495.75 : x
2. Step 2: Convert to fraction form
   81,109.50/108,495.75 = 108,495.75/x
3. Step 3: Cross multiply
   81,109.50x = 108,495.75 × 108,495.75
4. Step 4: Simplify right side
   81,109.50x = 11,771,327,768.06
5. Step 5: Solve for x
   x = 11,771,327,768.06/81,109.50
6. Step 6: Final answer
   x = 145,128.84