Finding the Third Proportional to 31,314 and 63,721

Step by Step Solution

1. Step 1: Write the proportion equation
   31,314 : 63,721 = 63,721 : x
2. Step 2: Convert to fraction form
   31,314/63,721 = 63,721/x
3. Step 3: Cross multiply
   31,314x = 63,721 × 63,721
4. Step 4: Simplify right side
   31,314x = 4,060,365,841
5. Step 5: Solve for x
   x = 4,060,365,841/31,314
6. Step 6: Final answer
   x = 129,666.15