Finding the Third Proportional to 42,478 and 67,485

Step by Step Solution

1. Step 1: Write the proportion equation
   42,478 : 67,485 = 67,485 : x
2. Step 2: Convert to fraction form
   42,478/67,485 = 67,485/x
3. Step 3: Cross multiply
   42,478x = 67,485 × 67,485
4. Step 4: Simplify right side
   42,478x = 4,554,225,225
5. Step 5: Solve for x
   x = 4,554,225,225/42,478
6. Step 6: Final answer
   x = 107,213.74