Finding the Third Proportional to 540,621 and 778,747.50

Step by Step Solution

1. Step 1: Write the proportion equation
   540,621 : 778,747.50 = 778,747.50 : x
2. Step 2: Convert to fraction form
   540,621/778,747.50 = 778,747.50/x
3. Step 3: Cross multiply
   540,621x = 778,747.50 × 778,747.50
4. Step 4: Simplify right side
   540,621x = 606,447,668,756.25
5. Step 5: Solve for x
   x = 606,447,668,756.25/540,621
6. Step 6: Final answer
   x = 1,121,761.21