Finding the Third Proportional to 417,721.50 and 913,689

Step by Step Solution

1. Step 1: Write the proportion equation
   417,721.50 : 913,689 = 913,689 : x
2. Step 2: Convert to fraction form
   417,721.50/913,689 = 913,689/x
3. Step 3: Cross multiply
   417,721.50x = 913,689 × 913,689
4. Step 4: Simplify right side
   417,721.50x = 834,827,588,721
5. Step 5: Solve for x
   x = 834,827,588,721/417,721.50
6. Step 6: Final answer
   x = 1,998,526.74