Finding the Third Proportional to 142,902 and 308,403

Step by Step Solution

1. Step 1: Write the proportion equation
   142,902 : 308,403 = 308,403 : x
2. Step 2: Convert to fraction form
   142,902/308,403 = 308,403/x
3. Step 3: Cross multiply
   142,902x = 308,403 × 308,403
4. Step 4: Simplify right side
   142,902x = 95,112,410,409
5. Step 5: Solve for x
   x = 95,112,410,409/142,902
6. Step 6: Final answer
   x = 665,577.88