Finding the Third Proportional to 139,368 and 212,328

Step by Step Solution

1. Step 1: Write the proportion equation
   139,368 : 212,328 = 212,328 : x
2. Step 2: Convert to fraction form
   139,368/212,328 = 212,328/x
3. Step 3: Cross multiply
   139,368x = 212,328 × 212,328
4. Step 4: Simplify right side
   139,368x = 45,083,179,584
5. Step 5: Solve for x
   x = 45,083,179,584/139,368
6. Step 6: Final answer
   x = 323,483.01