Finding the Third Proportional to 108,688.50 and 170,221.50

Step by Step Solution

1. Step 1: Write the proportion equation
   108,688.50 : 170,221.50 = 170,221.50 : x
2. Step 2: Convert to fraction form
   108,688.50/170,221.50 = 170,221.50/x
3. Step 3: Cross multiply
   108,688.50x = 170,221.50 × 170,221.50
4. Step 4: Simplify right side
   108,688.50x = 28,975,359,062.25
5. Step 5: Solve for x
   x = 28,975,359,062.25/108,688.50
6. Step 6: Final answer
   x = 266,590.85