Finding the Third Proportional to 405,718 and 630,701.50

Step by Step Solution

1. Step 1: Write the proportion equation
   405,718 : 630,701.50 = 630,701.50 : x
2. Step 2: Convert to fraction form
   405,718/630,701.50 = 630,701.50/x
3. Step 3: Cross multiply
   405,718x = 630,701.50 × 630,701.50
4. Step 4: Simplify right side
   405,718x = 397,784,382,102.25
5. Step 5: Solve for x
   x = 397,784,382,102.25/405,718
6. Step 6: Final answer
   x = 980,445.49