Finding the Third Proportional to 142,803 and 309,015

Step by Step Solution

1. Step 1: Write the proportion equation
   142,803 : 309,015 = 309,015 : x
2. Step 2: Convert to fraction form
   142,803/309,015 = 309,015/x
3. Step 3: Cross multiply
   142,803x = 309,015 × 309,015
4. Step 4: Simplify right side
   142,803x = 95,490,270,225
5. Step 5: Solve for x
   x = 95,490,270,225/142,803
6. Step 6: Final answer
   x = 668,685.32