Finding the Third Proportional to 215,043 and 300,768

Step by Step Solution

1. Step 1: Write the proportion equation
   215,043 : 300,768 = 300,768 : x
2. Step 2: Convert to fraction form
   215,043/300,768 = 300,768/x
3. Step 3: Cross multiply
   215,043x = 300,768 × 300,768
4. Step 4: Simplify right side
   215,043x = 90,461,389,824
5. Step 5: Solve for x
   x = 90,461,389,824/215,043
6. Step 6: Final answer
   x = 420,666.52