Finding the Third Proportional to 139,282 and 212,188

Step by Step Solution

1. Step 1: Write the proportion equation
   139,282 : 212,188 = 212,188 : x
2. Step 2: Convert to fraction form
   139,282/212,188 = 212,188/x
3. Step 3: Cross multiply
   139,282x = 212,188 × 212,188
4. Step 4: Simplify right side
   139,282x = 45,023,747,344
5. Step 5: Solve for x
   x = 45,023,747,344/139,282
6. Step 6: Final answer
   x = 323,256.04