Finding the Third Proportional to 401,563.50 and 621,786

Step by Step Solution

1. Step 1: Write the proportion equation
   401,563.50 : 621,786 = 621,786 : x
2. Step 2: Convert to fraction form
   401,563.50/621,786 = 621,786/x
3. Step 3: Cross multiply
   401,563.50x = 621,786 × 621,786
4. Step 4: Simplify right side
   401,563.50x = 386,617,829,796
5. Step 5: Solve for x
   x = 386,617,829,796/401,563.50
6. Step 6: Final answer
   x = 962,781.30