Finding the Third Proportional to 67,856.80 and 89,231.31

Step by Step Solution

1. Step 1: Write the proportion equation
   67,856.80 : 89,231.31 = 89,231.31 : x
2. Step 2: Convert to fraction form
   67,856.80/89,231.31 = 89,231.31/x
3. Step 3: Cross multiply
   67,856.80x = 89,231.31 × 89,231.31
4. Step 4: Simplify right side
   67,856.80x = 7,962,226,433.35
5. Step 5: Solve for x
   x = 7,962,226,433.35/67,856.80
6. Step 6: Final answer
   x = 117,338.67