Finding the Third Proportional to 405,616.69 and 630,549.38

Step by Step Solution

1. Step 1: Write the proportion equation
   405,616.69 : 630,549.38 = 630,549.38 : x
2. Step 2: Convert to fraction form
   405,616.69/630,549.38 = 630,549.38/x
3. Step 3: Cross multiply
   405,616.69x = 630,549.38 × 630,549.38
4. Step 4: Simplify right side
   405,616.69x = 397,592,514,312.89
5. Step 5: Solve for x
   x = 397,592,514,312.89/405,616.69
6. Step 6: Final answer
   x = 980,217.35