Finding the Third Proportional to 211,710 and 300,930

Step by Step Solution

1. Step 1: Write the proportion equation
   211,710 : 300,930 = 300,930 : x
2. Step 2: Convert to fraction form
   211,710/300,930 = 300,930/x
3. Step 3: Cross multiply
   211,710x = 300,930 × 300,930
4. Step 4: Simplify right side
   211,710x = 90,558,864,900
5. Step 5: Solve for x
   x = 90,558,864,900/211,710
6. Step 6: Final answer
   x = 427,749.59