Finding the Third Proportional to 400,470 and 620,254.50

Step by Step Solution

1. Step 1: Write the proportion equation
   400,470 : 620,254.50 = 620,254.50 : x
2. Step 2: Convert to fraction form
   400,470/620,254.50 = 620,254.50/x
3. Step 3: Cross multiply
   400,470x = 620,254.50 × 620,254.50
4. Step 4: Simplify right side
   400,470x = 384,715,644,770.25
5. Step 5: Solve for x
   x = 384,715,644,770.25/400,470
6. Step 6: Final answer
   x = 960,660.34