Finding the Third Proportional to 420,958.69 and 648,045.56

Step by Step Solution

1. Step 1: Write the proportion equation
   420,958.69 : 648,045.56 = 648,045.56 : x
2. Step 2: Convert to fraction form
   420,958.69/648,045.56 = 648,045.56/x
3. Step 3: Cross multiply
   420,958.69x = 648,045.56 × 648,045.56
4. Step 4: Simplify right side
   420,958.69x = 419,963,051,075.94
5. Step 5: Solve for x
   x = 419,963,051,075.94/420,958.69
6. Step 6: Final answer
   x = 997,634.84