Finding the Third Proportional to 621,588 and 877,369.50

Step by Step Solution

1. Step 1: Write the proportion equation
   621,588 : 877,369.50 = 877,369.50 : x
2. Step 2: Convert to fraction form
   621,588/877,369.50 = 877,369.50/x
3. Step 3: Cross multiply
   621,588x = 877,369.50 × 877,369.50
4. Step 4: Simplify right side
   621,588x = 769,777,239,530.25
5. Step 5: Solve for x
   x = 769,777,239,530.25/621,588
6. Step 6: Final answer
   x = 1,238,404.28