Finding the Third Proportional to 308,839.50 and 666,886

Step by Step Solution

1. Step 1: Write the proportion equation
   308,839.50 : 666,886 = 666,886 : x
2. Step 2: Convert to fraction form
   308,839.50/666,886 = 666,886/x
3. Step 3: Cross multiply
   308,839.50x = 666,886 × 666,886
4. Step 4: Simplify right side
   308,839.50x = 444,736,936,996
5. Step 5: Solve for x
   x = 444,736,936,996/308,839.50
6. Step 6: Final answer
   x = 1,440,026.09