Finding the Third Proportional to 139,385 and 210,383

Step by Step Solution

1. Step 1: Write the proportion equation
   139,385 : 210,383 = 210,383 : x
2. Step 2: Convert to fraction form
   139,385/210,383 = 210,383/x
3. Step 3: Cross multiply
   139,385x = 210,383 × 210,383
4. Step 4: Simplify right side
   139,385x = 44,261,006,689
5. Step 5: Solve for x
   x = 44,261,006,689/139,385
6. Step 6: Final answer
   x = 317,544.98