Finding the Third Proportional to 39,856 and 55,856

Step by Step Solution

1. Step 1: Write the proportion equation
   39,856 : 55,856 = 55,856 : x
2. Step 2: Convert to fraction form
   39,856/55,856 = 55,856/x
3. Step 3: Cross multiply
   39,856x = 55,856 × 55,856
4. Step 4: Simplify right side
   39,856x = 3,119,892,736
5. Step 5: Solve for x
   x = 3,119,892,736/39,856
6. Step 6: Final answer
   x = 78,279.12