Finding the Third Proportional to 31,145 and 63,211

Step by Step Solution

1. Step 1: Write the proportion equation
   31,145 : 63,211 = 63,211 : x
2. Step 2: Convert to fraction form
   31,145/63,211 = 63,211/x
3. Step 3: Cross multiply
   31,145x = 63,211 × 63,211
4. Step 4: Simplify right side
   31,145x = 3,995,630,521
5. Step 5: Solve for x
   x = 3,995,630,521/31,145
6. Step 6: Final answer
   x = 128,291.24