Finding the Third Proportional to 686,277 and 990,046.50

Step by Step Solution

1. Step 1: Write the proportion equation
   686,277 : 990,046.50 = 990,046.50 : x
2. Step 2: Convert to fraction form
   686,277/990,046.50 = 990,046.50/x
3. Step 3: Cross multiply
   686,277x = 990,046.50 × 990,046.50
4. Step 4: Simplify right side
   686,277x = 980,192,072,162.25
5. Step 5: Solve for x
   x = 980,192,072,162.25/686,277
6. Step 6: Final answer
   x = 1,428,274.69