Finding the Third Proportional to 411,196.50 and 621,168.75

Step by Step Solution

1. Step 1: Write the proportion equation
   411,196.50 : 621,168.75 = 621,168.75 : x
2. Step 2: Convert to fraction form
   411,196.50/621,168.75 = 621,168.75/x
3. Step 3: Cross multiply
   411,196.50x = 621,168.75 × 621,168.75
4. Step 4: Simplify right side
   411,196.50x = 385,850,615,976.56
5. Step 5: Solve for x
   x = 385,850,615,976.56/411,196.50
6. Step 6: Final answer
   x = 938,360.65