Finding the Third Proportional to 31,359 and 67,515

Step by Step Solution

1. Step 1: Write the proportion equation
   31,359 : 67,515 = 67,515 : x
2. Step 2: Convert to fraction form
   31,359/67,515 = 67,515/x
3. Step 3: Cross multiply
   31,359x = 67,515 × 67,515
4. Step 4: Simplify right side
   31,359x = 4,558,275,225
5. Step 5: Solve for x
   x = 4,558,275,225/31,359
6. Step 6: Final answer
   x = 145,357.80