Finding the Third Proportional to 415,917 and 621,103.50

Step by Step Solution

1. Step 1: Write the proportion equation
   415,917 : 621,103.50 = 621,103.50 : x
2. Step 2: Convert to fraction form
   415,917/621,103.50 = 621,103.50/x
3. Step 3: Cross multiply
   415,917x = 621,103.50 × 621,103.50
4. Step 4: Simplify right side
   415,917x = 385,769,557,712.25
5. Step 5: Solve for x
   x = 385,769,557,712.25/415,917
6. Step 6: Final answer
   x = 927,515.72