Finding the Third Proportional to 490,455 and 665,698.50

Step by Step Solution

1. Step 1: Write the proportion equation
   490,455 : 665,698.50 = 665,698.50 : x
2. Step 2: Convert to fraction form
   490,455/665,698.50 = 665,698.50/x
3. Step 3: Cross multiply
   490,455x = 665,698.50 × 665,698.50
4. Step 4: Simplify right side
   490,455x = 443,154,492,902.25
5. Step 5: Solve for x
   x = 443,154,492,902.25/490,455
6. Step 6: Final answer
   x = 903,557.91