Finding the Third Proportional to 40,856 and 87,640

Step by Step Solution

1. Step 1: Write the proportion equation
   40,856 : 87,640 = 87,640 : x
2. Step 2: Convert to fraction form
   40,856/87,640 = 87,640/x
3. Step 3: Cross multiply
   40,856x = 87,640 × 87,640
4. Step 4: Simplify right side
   40,856x = 7,680,769,600
5. Step 5: Solve for x
   x = 7,680,769,600/40,856
6. Step 6: Final answer
   x = 187,996.12