Finding the Third Proportional to 621,964 and 990,150

Step by Step Solution

1. Step 1: Write the proportion equation
   621,964 : 990,150 = 990,150 : x
2. Step 2: Convert to fraction form
   621,964/990,150 = 990,150/x
3. Step 3: Cross multiply
   621,964x = 990,150 × 990,150
4. Step 4: Simplify right side
   621,964x = 980,397,022,500
5. Step 5: Solve for x
   x = 980,397,022,500/621,964
6. Step 6: Final answer
   x = 1,576,292.23