Finding the Third Proportional to 426,568 and 642,555.50

Step by Step Solution

1. Step 1: Write the proportion equation
   426,568 : 642,555.50 = 642,555.50 : x
2. Step 2: Convert to fraction form
   426,568/642,555.50 = 642,555.50/x
3. Step 3: Cross multiply
   426,568x = 642,555.50 × 642,555.50
4. Step 4: Simplify right side
   426,568x = 412,877,570,580.25
5. Step 5: Solve for x
   x = 412,877,570,580.25/426,568
6. Step 6: Final answer
   x = 967,905.63