Finding the Third Proportional to 406,818 and 613,921.50

Step by Step Solution

1. Step 1: Write the proportion equation
   406,818 : 613,921.50 = 613,921.50 : x
2. Step 2: Convert to fraction form
   406,818/613,921.50 = 613,921.50/x
3. Step 3: Cross multiply
   406,818x = 613,921.50 × 613,921.50
4. Step 4: Simplify right side
   406,818x = 376,899,608,162.25
5. Step 5: Solve for x
   x = 376,899,608,162.25/406,818
6. Step 6: Final answer
   x = 926,457.55