Finding the Third Proportional to 69,072.75 and 81,688.50

Step by Step Solution

1. Step 1: Write the proportion equation
   69,072.75 : 81,688.50 = 81,688.50 : x
2. Step 2: Convert to fraction form
   69,072.75/81,688.50 = 81,688.50/x
3. Step 3: Cross multiply
   69,072.75x = 81,688.50 × 81,688.50
4. Step 4: Simplify right side
   69,072.75x = 6,673,011,032.25
5. Step 5: Solve for x
   x = 6,673,011,032.25/69,072.75
6. Step 6: Final answer
   x = 96,608.45