Finding the Third Proportional to 142,403 and 303,213

Step by Step Solution

1. Step 1: Write the proportion equation
   142,403 : 303,213 = 303,213 : x
2. Step 2: Convert to fraction form
   142,403/303,213 = 303,213/x
3. Step 3: Cross multiply
   142,403x = 303,213 × 303,213
4. Step 4: Simplify right side
   142,403x = 91,938,123,369
5. Step 5: Solve for x
   x = 91,938,123,369/142,403
6. Step 6: Final answer
   x = 645,619.29