Finding the Third Proportional to 42,718 and 67,107

Step by Step Solution

1. Step 1: Write the proportion equation
   42,718 : 67,107 = 67,107 : x
2. Step 2: Convert to fraction form
   42,718/67,107 = 67,107/x
3. Step 3: Cross multiply
   42,718x = 67,107 × 67,107
4. Step 4: Simplify right side
   42,718x = 4,503,349,449
5. Step 5: Solve for x
   x = 4,503,349,449/42,718
6. Step 6: Final answer
   x = 105,420.42