Finding the Third Proportional to 288,405 and 621,184.50

Step by Step Solution

1. Step 1: Write the proportion equation
   288,405 : 621,184.50 = 621,184.50 : x
2. Step 2: Convert to fraction form
   288,405/621,184.50 = 621,184.50/x
3. Step 3: Cross multiply
   288,405x = 621,184.50 × 621,184.50
4. Step 4: Simplify right side
   288,405x = 385,870,183,040.25
5. Step 5: Solve for x
   x = 385,870,183,040.25/288,405
6. Step 6: Final answer
   x = 1,337,945.54