Finding the Third Proportional to 31,227.75 and 67,720.50

Step by Step Solution

1. Step 1: Write the proportion equation
   31,227.75 : 67,720.50 = 67,720.50 : x
2. Step 2: Convert to fraction form
   31,227.75/67,720.50 = 67,720.50/x
3. Step 3: Cross multiply
   31,227.75x = 67,720.50 × 67,720.50
4. Step 4: Simplify right side
   31,227.75x = 4,586,066,120.25
5. Step 5: Solve for x
   x = 4,586,066,120.25/31,227.75
6. Step 6: Final answer
   x = 146,858.68