Finding the Third Proportional to 30,690 and 67,122

Step by Step Solution

1. Step 1: Write the proportion equation
   30,690 : 67,122 = 67,122 : x
2. Step 2: Convert to fraction form
   30,690/67,122 = 67,122/x
3. Step 3: Cross multiply
   30,690x = 67,122 × 67,122
4. Step 4: Simplify right side
   30,690x = 4,505,362,884
5. Step 5: Solve for x
   x = 4,505,362,884/30,690
6. Step 6: Final answer
   x = 146,802.31