Finding the Third Proportional to 31,212 and 67,716

Step by Step Solution

1. Step 1: Write the proportion equation
   31,212 : 67,716 = 67,716 : x
2. Step 2: Convert to fraction form
   31,212/67,716 = 67,716/x
3. Step 3: Cross multiply
   31,212x = 67,716 × 67,716
4. Step 4: Simplify right side
   31,212x = 4,585,456,656
5. Step 5: Solve for x
   x = 4,585,456,656/31,212
6. Step 6: Final answer
   x = 146,913.26