Finding the Third Proportional to 139,384 and 210,372

Step by Step Solution

1. Step 1: Write the proportion equation
   139,384 : 210,372 = 210,372 : x
2. Step 2: Convert to fraction form
   139,384/210,372 = 210,372/x
3. Step 3: Cross multiply
   139,384x = 210,372 × 210,372
4. Step 4: Simplify right side
   139,384x = 44,256,378,384
5. Step 5: Solve for x
   x = 44,256,378,384/139,384
6. Step 6: Final answer
   x = 317,514.05