Finding the Third Proportional to 142,980 and 308,121

Step by Step Solution

1. Step 1: Write the proportion equation
   142,980 : 308,121 = 308,121 : x
2. Step 2: Convert to fraction form
   142,980/308,121 = 308,121/x
3. Step 3: Cross multiply
   142,980x = 308,121 × 308,121
4. Step 4: Simplify right side
   142,980x = 94,938,550,641
5. Step 5: Solve for x
   x = 94,938,550,641/142,980
6. Step 6: Final answer
   x = 663,998.82