Finding the Third Proportional to 210,898.69 and 300,565.69

Step by Step Solution

1. Step 1: Write the proportion equation
   210,898.69 : 300,565.69 = 300,565.69 : x
2. Step 2: Convert to fraction form
   210,898.69/300,565.69 = 300,565.69/x
3. Step 3: Cross multiply
   210,898.69x = 300,565.69 × 300,565.69
4. Step 4: Simplify right side
   210,898.69x = 90,339,732,502.35
5. Step 5: Solve for x
   x = 90,339,732,502.35/210,898.69
6. Step 6: Final answer
   x = 428,356.07