Finding the Third Proportional to 42,255 and 85,676

Step by Step Solution

1. Step 1: Write the proportion equation
   42,255 : 85,676 = 85,676 : x
2. Step 2: Convert to fraction form
   42,255/85,676 = 85,676/x
3. Step 3: Cross multiply
   42,255x = 85,676 × 85,676
4. Step 4: Simplify right side
   42,255x = 7,340,376,976
5. Step 5: Solve for x
   x = 7,340,376,976/42,255
6. Step 6: Final answer
   x = 173,716.18