Finding the Third Proportional to 42,720 and 67,011

Step by Step Solution

1. Step 1: Write the proportion equation
   42,720 : 67,011 = 67,011 : x
2. Step 2: Convert to fraction form
   42,720/67,011 = 67,011/x
3. Step 3: Cross multiply
   42,720x = 67,011 × 67,011
4. Step 4: Simplify right side
   42,720x = 4,490,474,121
5. Step 5: Solve for x
   x = 4,490,474,121/42,720
6. Step 6: Final answer
   x = 105,114.09