Finding the Third Proportional to 664,242.50 and 1,057,454.50

Step by Step Solution

1. Step 1: Write the proportion equation
   664,242.50 : 1,057,454.50 = 1,057,454.50 : x
2. Step 2: Convert to fraction form
   664,242.50/1,057,454.50 = 1,057,454.50/x
3. Step 3: Cross multiply
   664,242.50x = 1,057,454.50 × 1,057,454.50
4. Step 4: Simplify right side
   664,242.50x = 1,118,210,019,570.25
5. Step 5: Solve for x
   x = 1,118,210,019,570.25/664,242.50
6. Step 6: Final answer
   x = 1,683,436.43