Finding the Third Proportional to 456,678 and 980,690.63

Step by Step Solution

1. Step 1: Write the proportion equation
   456,678 : 980,690.63 = 980,690.63 : x
2. Step 2: Convert to fraction form
   456,678/980,690.63 = 980,690.63/x
3. Step 3: Cross multiply
   456,678x = 980,690.63 × 980,690.63
4. Step 4: Simplify right side
   456,678x = 961,754,101,962.89
5. Step 5: Solve for x
   x = 961,754,101,962.89/456,678
6. Step 6: Final answer
   x = 2,105,978.62