Finding the Third Proportional to 289,636 and 630,762.63

Step by Step Solution

1. Step 1: Write the proportion equation
   289,636 : 630,762.63 = 630,762.63 : x
2. Step 2: Convert to fraction form
   289,636/630,762.63 = 630,762.63/x
3. Step 3: Cross multiply
   289,636x = 630,762.63 × 630,762.63
4. Step 4: Simplify right side
   289,636x = 397,861,489,096.89
5. Step 5: Solve for x
   x = 397,861,489,096.89/289,636
6. Step 6: Final answer
   x = 1,373,660.35