Finding the Third Proportional to 310,891.50 and 664,437

Step by Step Solution

1. Step 1: Write the proportion equation
   310,891.50 : 664,437 = 664,437 : x
2. Step 2: Convert to fraction form
   310,891.50/664,437 = 664,437/x
3. Step 3: Cross multiply
   310,891.50x = 664,437 × 664,437
4. Step 4: Simplify right side
   310,891.50x = 441,476,526,969
5. Step 5: Solve for x
   x = 441,476,526,969/310,891.50
6. Step 6: Final answer
   x = 1,420,034.09