Finding the Third Proportional to 207,978 and 308,908

Step by Step Solution

1. Step 1: Write the proportion equation
   207,978 : 308,908 = 308,908 : x
2. Step 2: Convert to fraction form
   207,978/308,908 = 308,908/x
3. Step 3: Cross multiply
   207,978x = 308,908 × 308,908
4. Step 4: Simplify right side
   207,978x = 95,424,152,464
5. Step 5: Solve for x
   x = 95,424,152,464/207,978
6. Step 6: Final answer
   x = 458,818.49