Finding the Third Proportional to 142,660 and 308,360

Step by Step Solution

1. Step 1: Write the proportion equation
   142,660 : 308,360 = 308,360 : x
2. Step 2: Convert to fraction form
   142,660/308,360 = 308,360/x
3. Step 3: Cross multiply
   142,660x = 308,360 × 308,360
4. Step 4: Simplify right side
   142,660x = 95,085,889,600
5. Step 5: Solve for x
   x = 95,085,889,600/142,660
6. Step 6: Final answer
   x = 666,521.03