Finding the Third Proportional to 415,530 and 620,561.25

Step by Step Solution

1. Step 1: Write the proportion equation
   415,530 : 620,561.25 = 620,561.25 : x
2. Step 2: Convert to fraction form
   415,530/620,561.25 = 620,561.25/x
3. Step 3: Cross multiply
   415,530x = 620,561.25 × 620,561.25
4. Step 4: Simplify right side
   415,530x = 385,096,265,001.56
5. Step 5: Solve for x
   x = 385,096,265,001.56/415,530
6. Step 6: Final answer
   x = 926,759.24