Finding the Third Proportional to 31,392 and 66,456

Step by Step Solution

1. Step 1: Write the proportion equation
   31,392 : 66,456 = 66,456 : x
2. Step 2: Convert to fraction form
   31,392/66,456 = 66,456/x
3. Step 3: Cross multiply
   31,392x = 66,456 × 66,456
4. Step 4: Simplify right side
   31,392x = 4,416,399,936
5. Step 5: Solve for x
   x = 4,416,399,936/31,392
6. Step 6: Final answer
   x = 140,685.52