Finding the Third Proportional to 418,311 and 646,360.50

Step by Step Solution

1. Step 1: Write the proportion equation
   418,311 : 646,360.50 = 646,360.50 : x
2. Step 2: Convert to fraction form
   418,311/646,360.50 = 646,360.50/x
3. Step 3: Cross multiply
   418,311x = 646,360.50 × 646,360.50
4. Step 4: Simplify right side
   418,311x = 417,781,895,960.25
5. Step 5: Solve for x
   x = 417,781,895,960.25/418,311
6. Step 6: Final answer
   x = 998,735.14