Finding the Third Proportional to 30,810 and 67,218

Step by Step Solution

1. Step 1: Write the proportion equation
   30,810 : 67,218 = 67,218 : x
2. Step 2: Convert to fraction form
   30,810/67,218 = 67,218/x
3. Step 3: Cross multiply
   30,810x = 67,218 × 67,218
4. Step 4: Simplify right side
   30,810x = 4,518,259,524
5. Step 5: Solve for x
   x = 4,518,259,524/30,810
6. Step 6: Final answer
   x = 146,649.12