Finding the Third Proportional to 419,562.56 and 645,271.31

Step by Step Solution

1. Step 1: Write the proportion equation
   419,562.56 : 645,271.31 = 645,271.31 : x
2. Step 2: Convert to fraction form
   419,562.56/645,271.31 = 645,271.31/x
3. Step 3: Cross multiply
   419,562.56x = 645,271.31 × 645,271.31
4. Step 4: Simplify right side
   419,562.56x = 416,375,066,735.47
5. Step 5: Solve for x
   x = 416,375,066,735.47/419,562.56
6. Step 6: Final answer
   x = 992,402.81