Finding the Third Proportional to 30,620 and 67,818

Step by Step Solution

1. Step 1: Write the proportion equation
   30,620 : 67,818 = 67,818 : x
2. Step 2: Convert to fraction form
   30,620/67,818 = 67,818/x
3. Step 3: Cross multiply
   30,620x = 67,818 × 67,818
4. Step 4: Simplify right side
   30,620x = 4,599,281,124
5. Step 5: Solve for x
   x = 4,599,281,124/30,620
6. Step 6: Final answer
   x = 150,205.13