Finding the Third Proportional to 30,860 and 67,120

Step by Step Solution

1. Step 1: Write the proportion equation
   30,860 : 67,120 = 67,120 : x
2. Step 2: Convert to fraction form
   30,860/67,120 = 67,120/x
3. Step 3: Cross multiply
   30,860x = 67,120 × 67,120
4. Step 4: Simplify right side
   30,860x = 4,505,094,400
5. Step 5: Solve for x
   x = 4,505,094,400/30,860
6. Step 6: Final answer
   x = 145,984.91