Finding the Third Proportional to 30,685.50 and 67,230

Step by Step Solution

1. Step 1: Write the proportion equation
   30,685.50 : 67,230 = 67,230 : x
2. Step 2: Convert to fraction form
   30,685.50/67,230 = 67,230/x
3. Step 3: Cross multiply
   30,685.50x = 67,230 × 67,230
4. Step 4: Simplify right side
   30,685.50x = 4,519,872,900
5. Step 5: Solve for x
   x = 4,519,872,900/30,685.50
6. Step 6: Final answer
   x = 147,296.70