Finding the Third Proportional to 139,356 and 212,310

Step by Step Solution

1. Step 1: Write the proportion equation
   139,356 : 212,310 = 212,310 : x
2. Step 2: Convert to fraction form
   139,356/212,310 = 212,310/x
3. Step 3: Cross multiply
   139,356x = 212,310 × 212,310
4. Step 4: Simplify right side
   139,356x = 45,075,536,100
5. Step 5: Solve for x
   x = 45,075,536,100/139,356
6. Step 6: Final answer
   x = 323,456.01