Finding the Third Proportional to 408,063.50 and 621,123

Step by Step Solution

1. Step 1: Write the proportion equation
   408,063.50 : 621,123 = 621,123 : x
2. Step 2: Convert to fraction form
   408,063.50/621,123 = 621,123/x
3. Step 3: Cross multiply
   408,063.50x = 621,123 × 621,123
4. Step 4: Simplify right side
   408,063.50x = 385,793,781,129
5. Step 5: Solve for x
   x = 385,793,781,129/408,063.50
6. Step 6: Final answer
   x = 945,425.85