Finding the Third Proportional to 31,320 and 65,220

Step by Step Solution

1. Step 1: Write the proportion equation
   31,320 : 65,220 = 65,220 : x
2. Step 2: Convert to fraction form
   31,320/65,220 = 65,220/x
3. Step 3: Cross multiply
   31,320x = 65,220 × 65,220
4. Step 4: Simplify right side
   31,320x = 4,253,648,400
5. Step 5: Solve for x
   x = 4,253,648,400/31,320
6. Step 6: Final answer
   x = 135,812.53