Finding the Third Proportional to 139,506 and 208,710

Step by Step Solution

1. Step 1: Write the proportion equation
   139,506 : 208,710 = 208,710 : x
2. Step 2: Convert to fraction form
   139,506/208,710 = 208,710/x
3. Step 3: Cross multiply
   139,506x = 208,710 × 208,710
4. Step 4: Simplify right side
   139,506x = 43,559,864,100
5. Step 5: Solve for x
   x = 43,559,864,100/139,506
6. Step 6: Final answer
   x = 312,243.66