Finding the Third Proportional to 139,110 and 208,695

Step by Step Solution

1. Step 1: Write the proportion equation
   139,110 : 208,695 = 208,695 : x
2. Step 2: Convert to fraction form
   139,110/208,695 = 208,695/x
3. Step 3: Cross multiply
   139,110x = 208,695 × 208,695
4. Step 4: Simplify right side
   139,110x = 43,553,603,025
5. Step 5: Solve for x
   x = 43,553,603,025/139,110
6. Step 6: Final answer
   x = 313,087.51