Finding the Third Proportional to 42,718 and 85,388

Step by Step Solution

1. Step 1: Write the proportion equation
   42,718 : 85,388 = 85,388 : x
2. Step 2: Convert to fraction form
   42,718/85,388 = 85,388/x
3. Step 3: Cross multiply
   42,718x = 85,388 × 85,388
4. Step 4: Simplify right side
   42,718x = 7,291,110,544
5. Step 5: Solve for x
   x = 7,291,110,544/42,718
6. Step 6: Final answer
   x = 170,680.05