Finding the Third Proportional to 31,915 and 67,865

Step by Step Solution

1. Step 1: Write the proportion equation
   31,915 : 67,865 = 67,865 : x
2. Step 2: Convert to fraction form
   31,915/67,865 = 67,865/x
3. Step 3: Cross multiply
   31,915x = 67,865 × 67,865
4. Step 4: Simplify right side
   31,915x = 4,605,658,225
5. Step 5: Solve for x
   x = 4,605,658,225/31,915
6. Step 6: Final answer
   x = 144,310.14