Finding the Third Proportional to 68,499 and 108,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   68,499 : 108,688.50 = 108,688.50 : x
2. Step 2: Convert to fraction form
   68,499/108,688.50 = 108,688.50/x
3. Step 3: Cross multiply
   68,499x = 108,688.50 × 108,688.50
4. Step 4: Simplify right side
   68,499x = 11,813,190,032.25
5. Step 5: Solve for x
   x = 11,813,190,032.25/68,499
6. Step 6: Final answer
   x = 172,457.85