Finding the Third Proportional to 401,558.50 and 621,778

Step by Step Solution

1. Step 1: Write the proportion equation
   401,558.50 : 621,778 = 621,778 : x
2. Step 2: Convert to fraction form
   401,558.50/621,778 = 621,778/x
3. Step 3: Cross multiply
   401,558.50x = 621,778 × 621,778
4. Step 4: Simplify right side
   401,558.50x = 386,607,881,284
5. Step 5: Solve for x
   x = 386,607,881,284/401,558.50
6. Step 6: Final answer
   x = 962,768.52