Finding the Third Proportional to 42,726 and 68,040

Step by Step Solution

1. Step 1: Write the proportion equation
   42,726 : 68,040 = 68,040 : x
2. Step 2: Convert to fraction form
   42,726/68,040 = 68,040/x
3. Step 3: Cross multiply
   42,726x = 68,040 × 68,040
4. Step 4: Simplify right side
   42,726x = 4,629,441,600
5. Step 5: Solve for x
   x = 4,629,441,600/42,726
6. Step 6: Final answer
   x = 108,351.86