Finding the Third Proportional to 139,396 and 331,210

Step by Step Solution

1. Step 1: Write the proportion equation
   139,396 : 331,210 = 331,210 : x
2. Step 2: Convert to fraction form
   139,396/331,210 = 331,210/x
3. Step 3: Cross multiply
   139,396x = 331,210 × 331,210
4. Step 4: Simplify right side
   139,396x = 109,700,064,100
5. Step 5: Solve for x
   x = 109,700,064,100/139,396
6. Step 6: Final answer
   x = 786,967.09