Finding the Third Proportional to 686,281 and 990,051

Step by Step Solution

1. Step 1: Write the proportion equation
   686,281 : 990,051 = 990,051 : x
2. Step 2: Convert to fraction form
   686,281/990,051 = 990,051/x
3. Step 3: Cross multiply
   686,281x = 990,051 × 990,051
4. Step 4: Simplify right side
   686,281x = 980,200,982,601
5. Step 5: Solve for x
   x = 980,200,982,601/686,281
6. Step 6: Final answer
   x = 1,428,279.35