Finding the Third Proportional to 31,478 and 63,868

Step by Step Solution

1. Step 1: Write the proportion equation
   31,478 : 63,868 = 63,868 : x
2. Step 2: Convert to fraction form
   31,478/63,868 = 63,868/x
3. Step 3: Cross multiply
   31,478x = 63,868 × 63,868
4. Step 4: Simplify right side
   31,478x = 4,079,121,424
5. Step 5: Solve for x
   x = 4,079,121,424/31,478
6. Step 6: Final answer
   x = 129,586.42