Finding the Third Proportional to 400,815 and 621,148.50

Step by Step Solution

1. Step 1: Write the proportion equation
   400,815 : 621,148.50 = 621,148.50 : x
2. Step 2: Convert to fraction form
   400,815/621,148.50 = 621,148.50/x
3. Step 3: Cross multiply
   400,815x = 621,148.50 × 621,148.50
4. Step 4: Simplify right side
   400,815x = 385,825,459,052.25
5. Step 5: Solve for x
   x = 385,825,459,052.25/400,815
6. Step 6: Final answer
   x = 962,602.35