Finding the Third Proportional to 30,686.34 and 67,910.91

Step by Step Solution

1. Step 1: Write the proportion equation
   30,686.34 : 67,910.91 = 67,910.91 : x
2. Step 2: Convert to fraction form
   30,686.34/67,910.91 = 67,910.91/x
3. Step 3: Cross multiply
   30,686.34x = 67,910.91 × 67,910.91
4. Step 4: Simplify right side
   30,686.34x = 4,611,891,187.70
5. Step 5: Solve for x
   x = 4,611,891,187.70/30,686.34
6. Step 6: Final answer
   x = 150,291.32