Finding the Third Proportional to 621,586 and 877,366.50

Step by Step Solution

1. Step 1: Write the proportion equation
   621,586 : 877,366.50 = 877,366.50 : x
2. Step 2: Convert to fraction form
   621,586/877,366.50 = 877,366.50/x
3. Step 3: Cross multiply
   621,586x = 877,366.50 × 877,366.50
4. Step 4: Simplify right side
   621,586x = 769,771,975,322.25
5. Step 5: Solve for x
   x = 769,771,975,322.25/621,586
6. Step 6: Final answer
   x = 1,238,399.80