Finding the Third Proportional to 31,472 and 63,856

Step by Step Solution

1. Step 1: Write the proportion equation
   31,472 : 63,856 = 63,856 : x
2. Step 2: Convert to fraction form
   31,472/63,856 = 63,856/x
3. Step 3: Cross multiply
   31,472x = 63,856 × 63,856
4. Step 4: Simplify right side
   31,472x = 4,077,588,736
5. Step 5: Solve for x
   x = 4,077,588,736/31,472
6. Step 6: Final answer
   x = 129,562.43