Finding the Third Proportional to 139,366 and 210,354

Step by Step Solution

1. Step 1: Write the proportion equation
   139,366 : 210,354 = 210,354 : x
2. Step 2: Convert to fraction form
   139,366/210,354 = 210,354/x
3. Step 3: Cross multiply
   139,366x = 210,354 × 210,354
4. Step 4: Simplify right side
   139,366x = 44,248,805,316
5. Step 5: Solve for x
   x = 44,248,805,316/139,366
6. Step 6: Final answer
   x = 317,500.72