Finding the Third Proportional to 31,392 and 68,499

Step by Step Solution

1. Step 1: Write the proportion equation
   31,392 : 68,499 = 68,499 : x
2. Step 2: Convert to fraction form
   31,392/68,499 = 68,499/x
3. Step 3: Cross multiply
   31,392x = 68,499 × 68,499
4. Step 4: Simplify right side
   31,392x = 4,692,113,001
5. Step 5: Solve for x
   x = 4,692,113,001/31,392
6. Step 6: Final answer
   x = 149,468.43