Finding the Third Proportional to 139,369 and 210,359

Step by Step Solution

1. Step 1: Write the proportion equation
   139,369 : 210,359 = 210,359 : x
2. Step 2: Convert to fraction form
   139,369/210,359 = 210,359/x
3. Step 3: Cross multiply
   139,369x = 210,359 × 210,359
4. Step 4: Simplify right side
   139,369x = 44,250,908,881
5. Step 5: Solve for x
   x = 44,250,908,881/139,369
6. Step 6: Final answer
   x = 317,508.98