Finding the Third Proportional to 31,480 and 64,418

Step by Step Solution

1. Step 1: Write the proportion equation
   31,480 : 64,418 = 64,418 : x
2. Step 2: Convert to fraction form
   31,480/64,418 = 64,418/x
3. Step 3: Cross multiply
   31,480x = 64,418 × 64,418
4. Step 4: Simplify right side
   31,480x = 4,149,678,724
5. Step 5: Solve for x
   x = 4,149,678,724/31,480
6. Step 6: Final answer
   x = 131,819.53