Finding the Third Proportional to 139,218 and 212,091

Step by Step Solution

1. Step 1: Write the proportion equation
   139,218 : 212,091 = 212,091 : x
2. Step 2: Convert to fraction form
   139,218/212,091 = 212,091/x
3. Step 3: Cross multiply
   139,218x = 212,091 × 212,091
4. Step 4: Simplify right side
   139,218x = 44,982,592,281
5. Step 5: Solve for x
   x = 44,982,592,281/139,218
6. Step 6: Final answer
   x = 323,109.03